WO2014177112A2 - 一种lte系统干扰协调的方法及装置 - Google Patents

一种lte系统干扰协调的方法及装置 Download PDF

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WO2014177112A2
WO2014177112A2 PCT/CN2014/079690 CN2014079690W WO2014177112A2 WO 2014177112 A2 WO2014177112 A2 WO 2014177112A2 CN 2014079690 W CN2014079690 W CN 2014079690W WO 2014177112 A2 WO2014177112 A2 WO 2014177112A2
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Prior art keywords
cell
rbs
scheduled
refers
allocated
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PCT/CN2014/079690
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English (en)
French (fr)
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WO2014177112A3 (zh
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冯波
许倩倩
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中兴通讯股份有限公司
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Priority to US15/107,622 priority Critical patent/US20160323893A1/en
Priority to EP14791919.5A priority patent/EP3091774A4/en
Publication of WO2014177112A2 publication Critical patent/WO2014177112A2/zh
Publication of WO2014177112A3 publication Critical patent/WO2014177112A3/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W16/00Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14Spectrum sharing arrangements between different networks
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/50Allocation or scheduling criteria for wireless resources
    • H04W72/54Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058Allocation criteria
    • H04L5/0073Allocation arrangements that take into account other cell interferences
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0001Arrangements for dividing the transmission path
    • H04L5/0003Two-dimensional division
    • H04L5/0005Time-frequency
    • H04L5/0007Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0032Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/50Allocation or scheduling criteria for wireless resources
    • H04W72/51Allocation or scheduling criteria for wireless resources based on terminal or device properties
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/50Allocation or scheduling criteria for wireless resources
    • H04W72/54Allocation or scheduling criteria for wireless resources based on quality criteria
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0037Inter-user or inter-terminal allocation

Definitions

  • the present invention relates to the field of mobile communications technologies, and in particular, to a method and apparatus for interference coordination in a LTE (Long Term Evolution) co-frequency networking. Background technique
  • the LTE system is a co-frequency networking.
  • co-channel interference in a small interval is indispensable. How to reduce inter-cell co-channel interference has always been the key to improving the cell throughput rate.
  • the load of the cell is generally not too high.
  • the RB utilization rate of the cell will be at a relatively low level.
  • the fluctuation of the user's service in the cell may result in specific to each.
  • the RB (Resource Block) utilization rate of the cell is high or low, which causes the system to evaluate the neighboring interference to be large and small, and cannot converge to a stable state. Affects the increase in cell throughput.
  • the present invention provides a method and apparatus for interference coordination in an LTE system, which solves the problem in the prior art that if a cell has a low average RB utilization rate for a period of time, but each RB's RB utilization rate is unstable. Co-channel interference problem.
  • a method for interference coordination of an LTE system including the following steps: calculating, according to an average value of the number of RBs scheduled by each cell, calculating a maximum number of RBs currently scheduled by the cell; The number of RBs allocated for each UE (User Equipment) that the current cell needs to schedule; after the number of RBs allocated for each UE, start to allocate RB positions for each UE of the cell.
  • the RB location allocated by the UE of the cell is not the same as or different from the RB location allocated by the UE of the neighboring cell.
  • RB4TTI mm(MeanRBWindow New + ARB, RB BW)
  • TTI refers to the transmission time
  • the RB refers to a resource block
  • M e ⁇ R5 3 ⁇ 4fo WA3 ⁇ 4w refers to the average number of RBs scheduled by each cell in a period
  • ⁇ TMR54 3 ⁇ 4rJ 7 refers to the number of RBs scheduled by each cell in a period.
  • T Wmdow refers to the time window length when the cell counts the average number of RBs scheduled for each cell
  • RB4TTI refers to the maximum number of RBs currently scheduled by the calculated cell
  • RB_BW refers to the number of RBs owned by the cell bandwidth, which means the amount.
  • RB4TTI min(MeanRBWindow New + ARB, RB_BW) includes '.
  • MeanRBWindow New refers to the mean of the number of RBs scheduled by each cell in a period.
  • the allocating the number of RBs for each UE that the current cell needs to be scheduled according to the maximum number of RBs includes: the number of allocated RBs for each UE that needs to be scheduled for the current cell is not less than the maximum number of RBs. After the RB number is allocated for each UE, the RB location is started to be allocated to each UE of the cell, so that the RB location allocated by the UE of the cell is different from the RB location allocated by the UE of the neighboring cell.
  • the neighboring cells in all the cells in the entire network are divided into different cell types; the same cell type in all cells in the entire network is selected to be different or not identical RB locations;
  • the selected RB location allocates an RB location for each UE of the cell, such that the UE allocated to the RB location of the cell is different from or different from the RB location allocated by the UE of the neighboring cell.
  • the selected selected RB location refers to a starting point for allocating an RB location as each UE of the cell.
  • the above method may further include: starting, starting from a starting point of the RB position allocated by each UE of the cell, and assigning an RB position to each UE of the cell according to an order of the RB from low frequency to high frequency or high frequency to low frequency.
  • an apparatus for interference coordination of an LTE system including: a module for calculating a maximum number of RBs, configured to calculate a maximum RB of a current cell scheduling according to an average value of the number of RBs scheduled by each cell of the cell.
  • the calculating a maximum RB number module includes: obtaining an average unit of the number of RBs, and setting an average value of the number of RBs scheduled for each cell of the cell: MeanRBWindow New SumRB4PerTTy.
  • RB4TTI mm (MeanRBWindow New + ARB, RB BW)
  • TTI refers to a transmission time interval
  • the RB refers to a resource block
  • M e ⁇ R5 3 ⁇ 4fo WA3 ⁇ 4w refers to each cell in a period.
  • the mean value of the number of scheduled RBs, ⁇ TMR54 3 ⁇ 4rJ 7 is the sum of the number of RBs scheduled by each cell in a period
  • T Wmdow is the time window length when the cell counts the average number of RBs scheduled for each cell.
  • RB4TTI is Refers to the maximum number of RBs currently scheduled by the calculated cell.
  • RB_BW refers to the number of RBs owned by the cell bandwidth, which refers to the remaining amount.
  • MeanRBWindow New refers to the average number of RBs scheduled by each cell in a period.
  • the invention makes the number of RBs per cell ⁇ change smaller, and enables the cell to avoid the interference of neighboring cells fixed on most RB segments, thereby improving the reliability of the traffic channel transmission and reducing the performance of the system. loss.
  • FIG. 1 is a flowchart of a method for interference coordination of an LTE system according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of an apparatus for interference coordination of an LTE system according to an embodiment of the present invention
  • FIG. 4 is a flowchart of calculating the number of scheduled RBs per cell in the LTE system interference coordination according to an embodiment of the present invention
  • FIG. 5 is a same frequency group provided by an embodiment of the present invention.
  • the network in the network is divided into three types of A ⁇ B ⁇ C;
  • FIG. 6 is a schematic diagram of RB location allocation for each type of cell according to an embodiment of the present invention.
  • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.
  • FIG. 1 is a flowchart of a method for interference coordination of an LTE system according to an embodiment of the present invention. As shown in FIG.
  • Step S101 Calculate a cell according to an average value of the number of RBs scheduled by each TTI of the cell. The maximum number of RBs scheduled by the current TTI; Step S102: allocate, according to the maximum number of RBs, each UE that needs to be scheduled for the current TTI of the cell
  • Step S103 After allocating the number of RBs for each UE, start to allocate an RB position for each UE of the cell, so that the RB location allocated by the UE of the cell and the UE of the neighboring cell The assigned RB locations are not identical or not identical.
  • RB4TTI mm(MeanRBWindow New + ARB, RB BW); wherein, the TT I refers to a transmission time interval, the RB refers to a resource block, and ⁇ oM ⁇ refers to an RB scheduled by each TTI of a cell in a period.
  • the mean value of the number, ⁇ TM ⁇ 54 3 ⁇ 4 ⁇ 7 refers to the sum of the number of RBs scheduled by each cell in a period, and T Wmdow refers to the time window length when the cell counts the average number of RBs scheduled by each TTI, and RB4TTI refers to the The maximum number of RBs for the current TTI scheduling of the cell is calculated.
  • RB_BW refers to the number of RBs owned by the cell bandwidth, which refers to the remaining amount.
  • the calculating the maximum number of RBs of the current TTI scheduling of the cell: RB4TTI min(MeanRBWindow New + ARB, RB_BW) includes '.
  • the maximum number of RBs for the pre-TTI scheduling refers to the number of RBs owned by the cell bandwidth
  • MeanRB Window New refers to the average of the number of RBs scheduled by each TTI of the cell in a period.
  • the number of RBs allocated to each UE that needs to be scheduled for the current TTI of the cell is based on the maximum number of RBs, including: the number of RBs allocated to each UE that needs to be scheduled for the current TTI of the cell is not less than the maximum RB. number.
  • the RB location is started to be allocated to each UE of the cell, so that the RB location allocated by the UE of the cell is allocated to the UE of the neighboring cell.
  • Having different or different RB positions includes: dividing adjacent cells in all cells in the entire network into different cell types; selecting RBs that are different or not identical in the same cell type in all cells in the entire network. Position: assigns an RB location to each UE of the cell according to the selected RB location, such that the UE allocated to the RB location of the cell is different from or different from the RB location allocated by the UE of the neighboring cell.
  • the selected selected RB location refers to a starting point for allocating an RB location as each UE of the cell.
  • the present invention further includes: starting from a starting point of each UE of the cell to allocate an RB position, and assigning an RB position to each UE of the cell according to an order of RBs from low frequency to high frequency or high frequency to low frequency.
  • FIG. 2 is a schematic diagram of an apparatus for interference coordination of an LTE system according to an embodiment of the present invention. As shown in FIG. 2, the method includes: calculating a maximum RB number module 201, and setting an average value of the number of RBs scheduled according to each TTI of the cell.
  • the RB number module 202 is configured to allocate, according to the maximum number of RBs, an RB number for each UE that needs to be scheduled for the current TTI of the cell; and allocate an RB location module 203, set to After the number of RBs is allocated to each UE, the RB location is started to be allocated to each UE of the cell, so that the RB location allocated by the UE of the cell is different from the RB location allocated by the UE of the neighboring cell or Not exactly the same.
  • the calculating the maximum RB number module 201 includes: obtaining an average unit of the number of RBs, and setting an average value of the number of RBs scheduled for each TTI of the cell:
  • MeanRBWindow New . Calculate the maximum number of units, set to calculate the cell
  • RB4TTI min(MeanRB Window New + ARB, RB BW); wherein, the TTI refers to a transmission time interval, the RB refers to a resource block, and MeanRBWindo WNew refers to a cell in a period.
  • RB4TTI refers to the maximum number of RBs scheduled by the current TTI of the calculated cell
  • RB_BW refers to the number of RBs owned by the cell bandwidth, which refers to the remaining amount.
  • RB4TTI refers to the maximum number of RBs scheduled by the current TTI of the calculated cell
  • RB_BW refers to the number of RBs owned by the cell bandwidth
  • MeanRBWindow New refers to the number of RBs scheduled by each TTI of the cell in one cycle Mean.
  • FIG. 3 is a flowchart of the interference coordination of the LTE system according to the embodiment of the present invention.
  • the method includes the following steps: Step S301: Calculate the maximum number of RBs scheduled by the current TTI of the cell; Design a timer T, after the base station is powered on , the timer is started, when the timer overflows, it is automatically cleared and re-counted, as shown in Figure 4: Whether the timer overflows, if yes, enter 2, otherwise enter 4;
  • ⁇ depart refers to the time window length when the cell counts the average number of RBs scheduled by each TTI, including only the uplink or downlink subframes, and the number of all subframes, ⁇ TMR54 3 ⁇ 4rr 7 is the timer.
  • the sum of the number of RBs scheduled by each TTI in the cell, ⁇ OM ⁇ is the average of the number of RBs scheduled by each TTI of the cell during the timer time.
  • Step S302 allocate, according to a certain rule, the number of RBs for each UE that needs to be scheduled by the current TTI of the cell;
  • the number of RBs The RB location is allocated to the UE that needs to be scheduled in the current TTI of the cell. All cells in the entire network are classified into N categories according to certain principles. Try to ensure that the types of neighboring cells are different.
  • Each type of cell selects a fixed RB location as the starting point for the RB location allocated by the cell.
  • the starting position of the cell RB is different.
  • all the cells in the entire network are classified into four types: B, C, and C, and the types of adjacent cells are different.
  • Each type of cell selects a fixed RB location as the cell allocation.
  • the starting point of the RB position, the starting position of the RB of different classes is different.
  • Cel lType PCI mod 3
  • PCI Physical Cel l ID
  • Cel lType uses PCI mode 3 is only an example.
  • cell type parameters can be obtained for other methods.
  • the cell allocates RB locations to the scheduling users, including the following three types:
  • Cel lType 0, the cell starts with the lowest frequency RB, and allocates the idle RB position to the small area user according to the RB from low frequency to high frequency;
  • Cel lType 1, starting with RB at 1/3 of the bandwidth, assigning the idle RB position to the cell user in the order of RB from low frequency to high frequency. If the number of RBs required by a certain UE is not found at the end of the frequency band, the RB position is continued to be allocated to the UE from the lowest frequency RB to the end of the frequency band;
  • Cel lType 2
  • the cell starts with the highest frequency RB, and allocates the idle RB position to the cell user according to the RB from the high frequency to the low frequency; or, the RB with the bandwidth of 2/3 is the starting RB, according to The RB allocates idle RB locations to the cell users from the low frequency to the high frequency order. If the number of RBs required by a certain UE is not found at the end of the frequency band, the RB position is continued to be allocated to the UE from the lowest frequency RB to the end of the frequency band.
  • the present invention can learn the RB usage of the cell in the past period of time, and the total number of RBs scheduled for the cell in each TTI of the next period, by periodically counting the average RB utilization of the cell.
  • the purpose is limited, so that the number of changes in the number of RBs per TTI scheduling of the cell is relatively small. And all cells in the entire network are classified into N categories according to a certain principle, and the types of neighboring cells are different as much as possible.
  • Each type of cell selects a fixed RB position as the starting point of the RB position allocated by the cell, and different types.
  • the starting position of the cell RB is not the same. The cell starts from the starting RB position, and assigns an RB position to each UE of the cell in the order of RB index from small to large, until the end of the band.
  • the cell When the highest frequency is allocated, the cell still has no UE allocated to the RB location, and the secondary cell Starting at the lowest frequency, the RB location is continued to be allocated to the cell UE until the frequency band is allocated or all users are allocated to the RB location as required.
  • the overall load of the cell is low, through the above solution, on the one hand, the number of RBs scheduled for each TTI scheduling of the cell is relatively uniform, and there is no sudden or small situation, and the neighbor cell interference estimated by the cell is relatively stable. Then, by classifying all the cells in the system, the cells are fixedly allocated on a part of the RB segments, and the cells in the same bandwidth are allocated in different frequency bands, so that the cells can be in most of the RBs.
  • the segment is fixed to avoid the interference of the neighboring cell, and achieves the purpose of inter-cell interference coordination; when the overall load of the cell is high, the method does not bring bad results to the system performance; on the other hand, the method can basically guarantee During a period of time, the number of RBs scheduled by the cell to be scheduled is limited, so as to ensure that the downlink base station transmit power does not exceed a certain value, so that the transmit power of the radio end is within a controllable range, and the efficiency of the power amplifier is ensured.

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Abstract

本发明公开了一种LTE系统干扰协调的方法及装置,涉及移动通信技术领域,上述方法包括以下步骤:根据小区每个TTI调度的RB数的平均值,计算小区当前TTI 调度的最大RB数目;基于所述最大RB数目,为所述小区当前TTI需要调度的每个 UE分配RB数目;在所述的为每个UE分配RB数目后,开始为所述小区的每个UE 分配RB位置,使得所述小区的UE分配到的RB位置与相邻小区的UE分配到的RB 位置不相同或不完全相同。本发明能够让小区在大部分RB段上固定的避开相邻小区的干扰,从而提高业务信道传输的可靠性,并减少了系统的性能损失。

Description

一种 LTE系统干扰协调的方法及装 技术领域 本发明涉及移动通信技术领域,尤其涉及 LTE (Long Term Evolution,长期演进技术) 同频组网中干扰协调的方法及装置。 背景技术
LTE系统是同频组网, 同频组网系统中, 小区间的同频干扰必不可少, 如何减小 小区间同频干扰一直是提高小区吞吐率的关键。 在实际的 LTE系统中, 小区的负荷一般不会太高, 较长时间统计, 小区 RB利用 率会处于一个比较低的水平, 但是, 小区中用户的业务起伏不定, 就会导致具体到每 个 TTI ( Transmission Time Interval, 传输时间间隔) 上, 小区的 RB(Resource Block, 资源块)利用率忽高忽低, 这会使系统评估邻区干扰忽大忽小, 无法收敛到一个稳定状 态, 从而影响到小区吞吐率的提升。 发明内容 本发明提供了一种 LTE系统干扰协调的方法及装置, 解决了现有技术中如果小区 在一段时间内平均 RB利用率较低, 但是每个 ΤΉ的 RB利用率又不稳定时的存在的 同频干扰问题。 根据本发明的一个方面, 提供了一种 LTE系统干扰协调的方法, 包括以下步骤: 根据小区每个 ΤΉ调度的 RB数目的平均值, 计算小区当前 ΤΉ调度的最大 RB 数目; 基于所述最大 RB 数目, 为所述小区当前 ΤΉ 需要调度的每个 UE ( User Equipment, 用户设备) 分配 RB数目; 在所述的为每个 UE分配 RB数目后, 开始为 所述小区的每个 UE分配 RB位置,使得所述小区的 UE分配到的 RB位置与相邻小区 的 UE分配到的 RB位置不相同或不完全相同。 所述根据小区每个 ΤΉ调度的 RB数目的平均值, 计算小区当前 ΤΉ调度的最大 RB 数目的步骤包括: 获取小区每个 TTI 调度的 RB 数目的平均值: MeanRBWindowNew = . 计算小区当前 TTI调度的最大 RB数目:
Figure imgf000003_0001
RB4TTI = mm(MeanRBWindowNew + ARB, RB BW) 其中, 所述 TTI是指传输时间间 隔, 所述 RB是指资源块 , Me^R5 ¾foWA¾w是指一个周期内小区每个 ΤΉ调度的 RB 数目的均值, ^™R54 ¾rJ 7是指一个周期内小区每个 ΤΉ调度的 RB数目之和, TWmdow 是指小区统计每个 ΤΉ调度的 RB数目均值时的时间窗长, RB4TTI是指所计算小区当 前 ΤΉ调度的最大 RB数目, RB_BW是指小区带宽拥有的 RB数目, 是指余量。 所 述 计 算 小 区 当 前 ΤΉ 调 度 的 最 大 RB 数 目 :
RB4TTI = min(MeanRBWindowNew + ARB, RB— BW)包括'. 当基站刚上电初始化时, 所 述计算小区当前 ΤΉ调度的最大 RB数目为 RB4TTI=RB_BW;当基站上电完成初始化 后 , 所 述 计 算 小 区 当 前 TTI 调 度 的 最 大 RB 数 目 为 RB4TTI = mm(MeanRBWindowNew + ARB, RB BW); 其中, RB4TTI是指所计算小区当 前 ΤΉ调度的最大 RB数目, RB BW是指小区带宽拥有的 RB数目, MeanRBWindowNew 是指一个周期内小区每个 ΤΉ调度的 RB数目的均值。 所述基于所述最大 RB数目, 为所述小区当前 ΤΉ需要调度的每个 UE分配 RB 数目包括: 为所述小区当前 ΤΉ需要调度的每个 UE分配 RB数目不小于所述最大的 RB数目。 在所述的为每个 UE分配 RB数目后, 开始为所述小区的每个 UE分配 RB位置, 使得所述小区的 UE分配到的 RB位置与相邻小区的 UE分配到的 RB位置不相同或不 完全相同包括: 将整个网络中所有小区中的相邻小区划分为不同的小区类型; 将所述 整个网络中所有小区中相同的小区类型选择不相同或不完全相同的 RB位置; 根据所 选择的 RB位置, 为所述小区的每个 UE分配 RB位置, 使得所述小区的 UE分配到得 RB位置与相邻小区的 UE分配到的 RB位置不相同或不完全相同。 所述所选选择的 RB位置是指作为所述小区的每个 UE分配 RB位置的起始点。 上述方法还可以包括: 所述小区的每个 UE分配 RB位置的起始点开始, 按照 RB 从低频到高频或高频到低频的顺序为所述小区的每个 UE分配的 RB位置。 根据本发明的另一方面, 提供了一种 LTE系统干扰协调的装置, 包括: 计算最大 RB数目模块, 设置为根据小区每个 ΤΉ调度的 RB数目的平均值, 计算小区当前 ΤΉ 调度的最大 RB数目; 分配 RB数目模块, 设置为基于所述最大 RB数目, 为所述小区 当前 ΤΉ需要调度的每个 UE分配 RB数目;分配 RB位置模块,设置为在所述的为每 个 UE分配 RB数目后, 开始为所述小区的每个 UE分配 RB位置, 使得所述小区的 UE分配到的 RB位置与相邻小区的 UE分配到的 RB位置不相同或不完全相同。 所述计算最大 RB数目模块包括: 获取 RB数目的平均值单元, 设置为获取小区 每个 ΤΉ调度的 RB数目的平均值: MeanRBWindowNew SumRB4PerTTy . 计算 最大 RB 数目单元, 设置为计算小区当前 TTI 调度的最大 RB 数目: RB4TTI = mm(MeanRBWindowNew + ARB, RB BW) 其中, 所述 TTI是指传输时间间 隔, 所述 RB是指资源块 , Me^R5 ¾foWA¾w是指一个周期内小区每个 ΤΉ调度的 RB 数目的均值, ^™R54 ¾rJ 7是指一个周期内小区每个 ΤΉ调度的 RB数目之和, TWmdow 是指小区统计每个 ΤΉ调度的 RB数目均值时的时间窗长, RB4TTI是指所计算小区当 前 ΤΉ调度的最大 RB数目, RB_BW是指小区带宽拥有的 RB数目, 是指余量。 所述计算最大 RB数目单元包括: 第一计算子单元, 设置为当基站刚上电初始化 时,所述计算小区当前 ΤΉ调度的最大 RB数目为 RB4TTI=RB_BW;第二计算子单元, 设置为当基站上电完成初始化后, 所述计算小区当前 ΤΉ 调度的最大 RB 数目为 RB4TTI = mm(MeanRBWindowNew + ARB, RB BW); 其中, RB4TTI是指所计算小区当 前 TTI调度的最大 RB数目, RB BW是指小区带宽拥有的 RB数目, MeanRBWindowNew 是指一个周期内小区每个 ΤΉ调度的 RB数目的均值。 本发明使得小区每个 ΤΉ调度 RB数目变化幅度较小,并能够让小区在大部分 RB 段上固定的避开相邻小区的干扰, 从而提高了业务信道传输的可靠性, 减少了系统的 性能损失。 附图说明 此处所说明的附图用来提供对本发明的进一步理解, 构成本申请的一部分, 本发 明的示意性实施例及其说明用于解释本发明, 并不构成对本发明的不当限定。 在附图 中: 图 1是本发明实施例提供的一种 LTE系统干扰协调的方法流程图; 图 2是本发明实施例提供的一种 LTE系统干扰协调的装置示意图; 图 3是本发明实施例提供的 LTE系统干扰协调的流程图; 图 4是本发明实施例提供的 LTE系统干扰协调中的计算每个 ΤΉ小区调度 RB数 目的流程图; 图 5是本发明实施例提供的同频组网中小区分为 A\B\C三类的示意图; 图 6是本发明实施例提供的每类小区的 RB位置分配示意图。 具体实施方式 以下结合附图对本发明的优选实施例进行详细说明, 应当理解, 以下所说明的优 选实施例仅用于说明和解释本发明, 并不用于限定本发明。 需要说明的是, 在不冲突 的情况下, 本申请中的实施例及实施例中的特征可以相互组合。 图 1 显示了本发明实施例提供的一种 LTE系统干扰协调的方法流程图, 如图 1所 示, 包括以下步骤: 步骤 S 101 : 根据小区每个 TTI调度的 RB数目的平均值, 计算小区当前 TTI调度 的最大 RB数目; 步骤 S 102 : 基于所述最大 RB数目, 为所述小区当前 TTI需要调度的每个 UE分配
RB数目; 步骤 S 103 : 在所述的为每个 UE分配 RB数目后, 开始为所述小区的每个 UE分配 RB位置, 使得所述小区的 UE分配到的 RB位置与相邻小区的 UE分配到的 RB位置不相 同或不完全相同。 其中,所述根据小区每个 TTI调度的 RB数目的平均值,计算小区当前 TTI调度的 最大 RB 数目的步骤包括: 获取小区每个 TTI 调度的 RB 数目的平均值: MeanRBWindowNew = SumRBAPerTTI/ . 计算小区当前 TTI调度的最大 RB数目:
RB4TTI = mm(MeanRBWindowNew + ARB, RB BW); 其中, 所述 TT I 是指传输时间间 隔, 所述 RB是指资源块, ^ ^ oM^^是指一个周期内小区每个 TTI调度的 RB 数目的均值, Λ™^54 ¾ΓΓ 7是指一个周期内小区每个 ΤΤΙ调度的 RB数目之和, TWmdow 是指小区统计每个 TTI调度的 RB数目均值时的时间窗长, RB4TTI是指所计算小区当 前 TTI调度的最大 RB数目, RB_BW是指小区带宽拥有的 RB数目, 是指余量。 具体地说 , 所述计算 小 区 当 前 TTI 调度 的最大 RB 数 目 : RB4TTI = min(MeanRBWindowNew + ARB, RB— BW)包括'. 当基站刚上电初始化时, 所 述计算小区当前 TTI调度的最大 RB数目为 RB4TTI=RB_BW; 当基站上电完成初始化后, 所 述 计 算 小 区 当 前 TTI 调 度 的 最 大 RB 数 目 为 RB4TTI = mm(MeanRBWindowNew + ARB, RB BW); 其中, RB4TTI 是指所计算小区当 前 TTI调度的最大 RB数目, RB_BW是指小区带宽拥有的 RB数目, MeanRB Window New是 指一个周期内小区每个 TTI调度的 RB数目的均值。 本发明所述基于所述最大 RB数目, 为所述小区当前 TTI需要调度的每个 UE分配 RB数目包括: 为所述小区当前 TTI需要调度的每个 UE分配 RB数目不小于所述最大的 RB数目。 具体地说, 在所述的为每个 UE分配 RB数目后, 开始为所述小区的每个 UE分配 RB位置, 使得所述小区的 UE分配到的 RB位置与相邻小区的 UE分配到的 RB位置不相 同或不完全相同包括: 将整个网络中所有小区中的相邻小区划分为不同的小区类型; 将所述整个网络中所有小区中相同的小区类型选择不相同或不完全相同的 RB位置;根 据所选择的 RB位置, 为所述小区的每个 UE分配 RB位置, 使得所述小区的 UE分配到 得 RB位置与相邻小区的 UE分配到的 RB位置不相同或不完全相同。 所述所选选择的 RB位置是指作为所述小区的每个 UE分配 RB位置的起始点。 本发明还包括: 所述小区的每个 UE分配 RB位置的起始点开始,按照 RB从低频到 高频或高频到低频的顺序为所述小区的每个 UE分配的 RB位置。 图 2显示了本发明实施例提供的一种 LTE系统干扰协调的装置示意图, 如图 2所 示, 包括: 计算最大 RB数目模块 201, 设置为根据小区每个 TTI调度的 RB数目的平 均值, 计算小区当前 TTI调度的最大 RB数目; 分配 RB数目模块 202, 设置为基于所 述最大 RB数目, 为所述小区当前 TTI需要调度的每个 UE分配 RB数目; 分配 RB位置 模块 203, 设置为在所述的为每个 UE分配 RB数目后, 开始为所述小区的每个 UE分配 RB位置, 使得所述小区的 UE分配到的 RB位置与相邻小区的 UE分配到的 RB位置不相 同或不完全相同。 其中, 所述计算最大 RB数目模块 201包括: 获取 RB数目的平均值单元, 设置为 获 取 小 区 每 个 TTI 调 度 的 RB 数 目 的 平 均 值 :
MeanRBWindowNew = . 计算最大 数目单元, 设置为计算小区
Figure imgf000007_0001
当前 TTI调度的最大 RB数目: RB4TTI = min(MeanRB Window New + ARB, RB BW); 其 中,所述 TTI是指传输时间间隔,所述 RB是指资源块, MeanRBWindoWNew是指一个周 期内小区每个 TTI调度的 RB数目的均值, SumRMPerTTI是指一个周期内小区每个 TTI 调度的 RB数目之和, ^„ 是指小区统计每个 TTI调度的 RB数目均值时的时间窗长,
RB4TTI是指所计算小区当前 TTI调度的最大 RB数目, RB_BW是指小区带宽拥有的 RB 数目, 是指余量。 具体地说, 所述计算最大 RB数目单元包括: 第一计算子单元, 设置为当基站刚上 电初始化时, 所述计算小区当前 TTI调度的最大 RB数目为 RB4TTI=RB_BW; 第二计算 子单元, 设置为当基站上电完成初始化后,所述计算小区当前 TTI调度的最大 RB数目 为 RB4TTI =
Figure imgf000008_0001
+ ARB,RB— BW ·' 其中, RB4TTI 是指所计算小区 当前 TTI调度的最大 RB数目, RB_BW是指小区带宽拥有的 RB数目, MeanRBWindowNew 是指一个周期内小区每个 TTI调度的 RB数目的均值。 图 3显示了本发明实施例提供的 LTE系统干扰协调的流程图, 如图 3所示, 包括 以下步骤: 步骤 S301 : 计算小区当前 TTI调度的最大 RB数目; 设计定时器 T, 基站上电后, 则启动定时器 Τ, 当定时器溢出后, 自动清零, 重新 计数, 如图 4所示: 定时器是否溢出, 若是, 进入 2, 否则进入 4;
MeanRBWindowMew = 进入 3.
Figure imgf000008_0002
特别地, 对于 TDD模式, ^„ 是指小区统计每个 TTI调度的 RB数目均值时的时 间窗长, 只包含上行或者下行子帧, 非所有子帧的数目, ^™R54 ¾rr 7为定时器时 间内, 小区每个 TTI调度的 RB数目之和, ^^ OM ^为定时器时间内, 小区每 个 TTI调度的 RB数目的均值。
3、 RB4TTI = (MeanRBWindowNew + ARB, RB BW); 特别地,当基站刚上电时,计数器 T刚刚计时还未溢出时, RB4TTI = RB _BW。 4、 T=T+1。 其中, ^™^54 ¾Γ777为一个周期内某个小区每个 ΤΤΙ调度的 RB数目之和, 初始化时
Figure imgf000008_0003
= 0。 RB4TTI代表小区当前 TTI可以调度的总 RB数目; RB_BW 代表小区带宽拥有的 RB数目;初始化 RB4TTI=RB_BW; ARB为余量设计,默认屬= 0。 步骤 S302 :按照一定规则,为所述小区当前 TTI需要调度的每个 UE分配 RB数目; 所述小区在给每个 UE分配 RB数目时, 当分配到 RB4TTI后, 就不再给其他 UE分 配 RB数目了,直接进入 RB位置分配, SumRBAPerTTI = SumRBAPerTTI + RBNumATTI, RBNumATTI为小区当前 TTI实际分配的 RB数目。 步骤 S303: 在小区当前 TTI给需要调度的 UE分配 RB位置。 将整个网络中的所有小区按照某种原则分为 N类, 尽量保证相邻小区的类型不相 同, 每一类小区选择一个固定的 RB位置, 作为该小区分配 RB位置的起始点, 不同类 的小区 RB起始位置不相同。 下面结合图 5和图 6为例, 将整个网络中的所有小区分成4、 B、 C三类, 并且相 邻小区的类型不相同, 每一类小区选择一个固定的 RB位置, 作为该小区分配 RB位置 的起始点, 不同类的小区 RB起始位置不相同。
Cel lType = PCI mod 3, PCI : Physical Cel l ID, 这里 Cel lType用 PCI模 3只 是举例, 实际系统中可以为其他方法得到小区类型参数。 小区给调度用户分配 RB位置, 包括以下三种:
Cel lType = 0, 小区以最低频的 RB为起始 RB, 按照 RB从低频到高频的顺序给小 区用户分配空闲 RB位置;
Cel lType = 1, 以带宽的 1/3处 RB为起始 RB, 按照 RB从低频到高频的顺序给 小区用户分配空闲 RB位置。若到频带末尾, 找不够某 UE需要的 RB数目, 则从以最低 频的 RB到频带末尾, 继续给该 UE分配 RB位置;
Cel lType = 2, 小区以最高频的 RB为起始 RB, 按照 RB从高频到低频的顺序给小 区用户分配空闲 RB位置; 或者, 以带宽的 2/3处 RB为起始 RB, 按照 RB从低频到高 频的顺序给小区用户分配空闲 RB位置。 若到频带末尾, 找不够某 UE需要的 RB数目, 则从以最低频的 RB到频带末尾, 继续给该 UE分配 RB位置。 综上所述, 本发明通过周期性的统计小区的平均 RB利用率, 可以了解到, 在过去 一段时间内, 小区的 RB使用情况, 在下一个周期的每个 TTI里, 对小区调度的 RB总 数目进行限制, 使得小区每个 TTI调度 RB数目变化幅度比较小。并且将整个网络中的 所有小区按照某种原则分为 N类, 尽量保证相邻小区的类型不相同, 每一类小区选择 一个固定的 RB位置, 作为该小区分配 RB位置的起始点,不同类的小区 RB起始位置不 相同。 小区从起始 RB位置开始, 按照 RB索引由小到大的顺序, 给小区每一个 UE分配 RB位置, 直到频带末尾。 当分到最高频时, 小区仍有 UE未分配到 RB位置, 则从小区 最低频开始, 继续给小区 UE分配 RB位置, 直到把频带分配完毕或者给所有用户都按 照需求分配到 RB位置。 当小区总体负荷较低时, 通过上述方案, 一方面, 保证小区每个 TTI 调度的 RB 数目都比较均匀, 不会出现忽大忽小的情况, 小区估计的邻小区干扰就会处于一个比 较稳定的状态; 然后再通过把系统中所有小区分类, 各个小区之间把业务固定分配在 一部分 RB段上, 而不同类的小区, 分在整个带宽不同的频带, 这样就能够让小区在大 部分 RB段上固定的避开相邻小区的干扰, 达到小区间干扰协调的目的; 当小区总体负 荷较高时, 该方法也不会给系统性能带来不良结果; 另一方面, 该方法能够基本保证 在一段时间内, 限制小区的调度最大调度的 RB数目,从而保证下行基站发射功率不会 超过某个值, 这样, 射频端的发射功率就在可控范围内, 保证功放的效率。 尽管上文对本发明进行了详细说明, 但是本发明不限于此, 本技术领域技术人员 可以根据本发明的原理进行各种修改。 因此, 凡按照本发明原理所作的修改, 都应当 理解为落入本发明的保护范围。

Claims

权 利 要 求 书
1. 一种 LTE系统干扰协调的方法, 包括以下步骤:
根据小区每个传输时间间隔 ΤΉ调度的资源块 RB数目的平均值, 计算小 区当前 ΤΉ调度的最大 RB数目;
基于所述最大 RB数目,为所述小区当前 ΤΉ需要调度的每个 UE分配 RB 数目;
在所述的为每个 UE分配 RB数目后, 开始为所述小区的每个 UE分配 RB 位置,使得所述小区的 UE分配到的 RB位置与相邻小区的 UE分配到的 RB位 置不相同或不完全相同。
2. 根据权利要求 1所述的方法, 其中, 所述根据小区每个 ΤΉ调度的 RB数目的 平均值, 计算小区当前 ΤΉ调度的最大 RB数目的步骤包括:
获 取 小 区 每 个 TTI 调 度 的 RB 数 目 的 平 均 值 : MeanRBWindowAI_ =
Figure imgf000011_0001
计 算 小 区 当 前 TTI 调 度 的 最 大 RB 数 目 : RB4TTI = (MeanRBWindowNew + ARB, RB BW); 其中,所述 TTI是指传输时间间隔,所述 RB是指资源块, MeanRB Window New 是指一个周期内小区每个 ΤΉ调度的 RB数目的均值, S誦議 PerTTI是指一 个周期内小区每个 ΤΉ调度的 RB数目之和, ^dw是指小区统计每个 ΤΉ调 度的 RB数目均值时的时间窗长, RB4TTI是指所计算小区当前 ΤΉ调度的最 大 RB数目, RB_BW是指小区带宽拥有的 RB数目, 是指余量。
3. 根据权利要求 2所述的方法, 其中, 所述计算小区当前 ΤΉ调度的最大 RB数 目: RB4TTI = mm(MeanRBWindowNew + ARB, R5 _ 5 )包括: 当基站刚上电初始化时, 所述计算小区当前 ΤΉ调度的最大 RB 数目为 RB4TTI=RB_BW;
当基站上电完成初始化后, 所述计算小区当前 ΤΉ调度的最大 RB数目为 RB4TTI = (MeanRBWindowNew + ARB, RB BW); 其中, RB4TTI是指所计算小区当前 TTI调度的最大 RB数目, RB_BW是 指小区带宽拥有的 RB数目, M nRBWindowNew是指一个周期内小区每个 TTI 调度的 RB数目的均值。
4. 根据权利要求 2或 3所述的方法, 其中, 所述基于所述最大 RB数目, 为所述 小区当前 ΤΉ需要调度的每个 UE分配 RB数目包括:
为所述小区当前 ΤΉ需要调度的每个 UE分配 RB数目不小于所述最大的 RB数目。
5. 根据权利要求 4所述的方法, 其中, 在所述的为每个 UE分配 RB数目后, 开 始为所述小区的每个 UE分配 RB位置,使得所述小区的 UE分配到的 RB位置 与相邻小区的 UE分配到的 RB位置不相同或不完全相同包括:
将整个网络中所有小区中的相邻小区划分为不同的小区类型; 将所述整个网络中所有小区中相同的小区类型选择不相同或不完全相同的 RB位置;
根据所选择的 RB位置,为所述小区的每个 UE分配 RB位置,使得所述小 区的 UE分配到得 RB位置与相邻小区的 UE分配到的 RB位置不相同或不完全 相同。
6. 根据权利要求 5所述的方法, 其中, 所述所选选择的 RB位置是指作为所述小 区的每个 UE分配 RB位置的起始点。
7. 根据权利要求 6所述的方法, 其中, 还包括:
所述小区的每个 UE分配 RB位置的起始点开始,按照 RB从低频到高频或 高频到低频的顺序为所述小区的每个 UE分配的 RB位置。
8. —种 LTE系统干扰协调的装置, 包括:
计算最大资源块 RB数目模块, 设置为根据小区每个传输时间间隔 ΤΉ调 度的 RB数目的平均值, 计算小区当前 ΤΉ调度的最大 RB数目;
分配 RB数目模块, 设置为基于所述最大 RB数目, 为所述小区当前 ΤΉ 需要调度的每个 UE分配 RB数目;
分配 RB位置模块,设置为在所述的为每个 UE分配 RB数目后,开始为所 述小区的每个 UE分配 RB位置,使得所述小区的 UE分配到的 RB位置与相邻 小区的 UE分配到的 RB位置不相同或不完全相同。 根据权利要求 8所述的装置, 其中, 所述计算最大 RB数目模块包括: 获取 RB数目的平均值单元, 设置为获取小区每个 ΤΉ调度的 RB数目的 平均值: MeanRBWindowN = ;
Figure imgf000013_0001
计算最大 RB数目单元, 设置为计算小区当前 ΤΉ调度的最大 RB数目: RB4TTI = (MeanRBWindowNew + ARB, RB BW); 其中,所述 TTI是指传输时间间隔,所述 RB是指资源块, MeanRB Window New 是指一个周期内小区每个 ΤΉ调度的 RB数目的均值, S誦議 PerTTI是指一 个周期内小区每个 ΤΉ调度的 RB数目之和, ^dw是指小区统计每个 ΤΉ调 度的 RB数目均值时的时间窗长, RB4TTI是指所计算小区当前 ΤΉ调度的最 大 RB数目, RB_BW是指小区带宽拥有的 RB数目, 是指余量。 根据权利要求 9所述的装置, 其中, 所述计算最大 RB数目单元包括: 第一计算子单元, 设置为当基站刚上电初始化时, 所述计算小区当前 ΤΉ 调度的最大 RB数目为 RB4TTI=RB_BW;
第二计算子单元,设置为当基站上电完成初始化后,所述计算小区当前 ΤΉ 调度的最大 RB数目为 RB4TTI = mm(MeanRBWindowNew + ARB, RB _ BW); 其中, RB4TTI是指所计算小区当前 ΤΉ调度的最大 RB数目, RB_BW是 指小区带宽拥有的 RB数目, M nRBWindowNew是指一个周期内小区每个 TTI 调度的 RB数目的均值。
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