CN100466799C - 软频率复用的方法 - Google Patents

软频率复用的方法 Download PDF

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CN100466799C
CN100466799C CNB2005101155797A CN200510115579A CN100466799C CN 100466799 C CN100466799 C CN 100466799C CN B2005101155797 A CNB2005101155797 A CN B2005101155797A CN 200510115579 A CN200510115579 A CN 200510115579A CN 100466799 C CN100466799 C CN 100466799C
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user
subcarrier
base station
central area
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CN1964548A (zh
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吴树兴
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Abstract

本发明涉及一种方向天线模式下的软频率复用的方法，其核心是：在多载波***的方向天线模式下，通过网络规划由基站控制器RNC对每个扇区进行主副子载波的划分，并根据各个扇区的业务量确定每个扇区的最大发射功率，并通过基站确定相应的主副子载波的发射功率；然后基站与用户间基于分配的相应子载波进行通信。本发明基于方向天线模式下部署的多载波***对用户进行子载波分配，更符合实际***的要求，从而扩展性较好；另外，本发明给不同区域用户分配不同功率的子载波，从而能够提高频谱资源利用率；而且，本发明是根据扇区中中心区域和边缘区域用户数量确定主副子载波的功率比率，因此能够随着当前扇区的业务量进行调节。

Description

软频率复用的方法
技术领域
本发明涉及通信领域，尤其涉及一种软频率复用的方法。
背景技术
下一代移动通信技术需要支持从话音，数据，音频，视频，图像等广泛应用的多种业务类型。为了支持多种类型业务，要求下一代移动通信***支持更高的数据速率，更高的频谱效率，以及要求其具备完善的QOS保障机制，并提供更好的移动性支持和网络无缝覆盖，实现为用户随时随地提供通信服务的目标。
第二代移动通信以时分多址(TDMA)技术，(如全球移动通讯***(GSM))和窄带码分多址技术为主要的接入技术。第三代移动通信以宽带码分多址技术(如通用移动通信***(UMTS)、宽带码分多址***(WCDMA))为主要的接入技术。在所述码分多址技术当中，一个用户数据符号将占用所有的载频宽度，不同的用户或者用户数据通过扩频码来进行区分。由于多径信道容易破坏扩频码之间的正交性，使得CDMA技术成为一个自干扰的***，因此***容量和频谱效率无法满足宽带无线通信的要求。
为了提高宽带无线通信***容量和频谱效率，出现了多载波技术，其基本思想是将一个宽带载波划分成多个子载波，并在多个子载波上同时传输数据。在应用当中，要求子载波的宽度小于***信道的相干带宽，这样每个子载波上的衰落为平坦衰落，因而能够减少符号间串扰，并且不需要复杂的信道均衡，适合高速数据的传输。多载波技术有多种形式，如正交频分多址(OFDMA)、多载波码分多址(MC-CDMA)、多载波直扩码分多址(MC-DS-CDMA)技术，以及时频域二维扩展技术，以及在此基础上的多种扩展技术。
其中，正交频分复用(Orthogonal Frequency Division Multiplexing，OFDM)技术是多载波技术当中比较有代表性的一种技术，它在频域内将给定信道分成许多正交子信道，并且允许子载波频谱部分重叠，只要满足子载波间相互正交，则可以从混叠的子载波上分离出数据信号。一个基本的OFDM调制和解调过程如图1所示的OFDM***框图，包括:
用户数据首先经过信道编码和交织处理，并采用某种调制方法，如BPSK、QPSK、QAM等形成符号；然后进行OFDM操作，经过OFDM操作后调制到射频上。在进行OFDM操作过程当中，首先将符号进行串行/并行转换，形成多个低速的子数据流，每个数据流占用一个子载波。子数据流到子载波的映射可以通过一个IDFT或者IFFT实现。同时它使用循环前缀(CP)作为保护间隔，大大减少，甚至消除码间干扰，并且保证了各信道间的正交性，从而大大减少了信道间干扰。
随后在多载波技术的基础上，陆续出现了强多载波调制与CDMA相结合的方法的研究，目前主要划分为两大类:频域扩展和时域扩展，如图2所示:
用户数据经过信道编码、交织和调制后形成符号，形成的符号在进行OFDM操作之前，首先进行频域或者时域扩展。如果只进行频域扩展，则称为MC-CDMA，如果只进行时域扩展，则称为MC-DS-CDMA。在时域和频域扩展同时存在的情况下，则称为时频域二维扩展的多载波技术。
在上面的介绍当中，多载波的映射通过离散傅立叶反变换/快速傅立叶反变换(IDFT/IFFT)实现，各个子载波之间频谱相互重叠并且保持正交，并且使用循环前缀来克服符号间串扰。在OFDM技术当中，也可以通过加窗的方法加快子载波频谱的带外衰减，也存在一些技术手段避免使用循环保护前缀。因此，一个更加广义的多载波***的***框图如图3所示，其基本原理如下:
用户数据首先经过调制处理。该调制处理可能包括信道编码、交织、符号调制以及时域和频域扩展等操作，得到的数据在进行串并转换后，以一定的技术手段映射到多个子载波上去，这些子载波可以是正交的，也可以是非正交的，经过并/串变换后调制到射频上去。
与本发明相关的现有技术一，其是在天线模式下采用基于多载波技术的软频率复用的方案。其主要思想是:
由于小区边缘是干扰最恶劣的区域，因此在实际的运营当中，终端会处于小区的中心靠近基站位置。这样一方面来自本小区的信号功率比较高，另一方面，来自邻小区的干扰比较小，因此能够获得比较高的信噪比。这就意味着，在小区的中心区域，可以使用邻小区的频率，实现高速率的通信，具体方案如图4所示:
用户11和12属于基站1，用户21和22属于基站2，用户31和32属于基站3。用户11，21，31位于三小区的边缘区域，终端12，22，32接近本小区基站天线，即位于小区的中心区域。
为位于小区边缘区域的用户分配不同频率的子载波；对位于小区中心区域的用户采用限制发射功率的方法。于是，形成如下规划方案:
对于位于小区边缘区域的用户，使用复用因子为3的频率规划方案，对于靠近基站的地区，采用复用因子为1的方案。而且对小区的中心区域的用户采用限制发射功率的方法，形成复用因子为1的孤岛覆盖。
由现有技术的技术方案可以看出，其是在全向天线模式下基于多载波***实现的，而实际的多载波***大多是在方向天线的扇区下部署的，因此现有技术存在如下技术缺陷:
现有技术未提出在方向天线模式下如何对扇区下的用户进行子载波分配的方案，因此对于目前存在的大多数基于方向天线下的扇区部署的多载波***，其实用性受到限制，不适于扩展。
发明内容
本发明的目的是提供一种软频率复用的方法，通过本发明，能够基于方向天线模式下部署的多载波***对用户进行子载波分配，更符合实际***的要求，从而扩展性较好。
本发明的目的是通过以下技术方案实现的:
本发明提供一种方向天线模式下的软频率复用的方法，其包括:
A、在多载波***的方向天线模式下，由基站控制器RNC对每个扇区进行主副子载波的划分，并根据各个扇区的业务量和基站的最大发射功率确定每个扇区的最大发射功率，并且每隔一定的时间间隔，根据所述扇区内的业务状况对扇区的最大发射功率进行更新，并通过基站确定相应的主副子载波的发射功率；
B、当用户进入某扇区时，将所述确定发射功率的主子载波或副子载波相应地分配给用户，基站与用户间基于分配的相应子载波进行通信。
其中，所述步骤A具体包括:
在多载波***的方向天线模式下，基站根据处于扇区中的中心区域和边缘区域用户数量或业务数量，主副子载波的功率比例和该扇区的最大发射功率来确定相应的主副子载波的发射功率。
其中，所述步骤A具体包括:
A1、在多载波***的方向天线模式下，基站按照多载波***中扇区数量N将每个扇区的子载波分成相互不重叠的N组，并选择其中的一组作为本扇区的主子载波，另外的子载波作为本扇区的副子载波；
A2、基站控制器RNC获取每一个扇区内中心区域和边缘区域的用户数量；
A3、当RNC根据所述中心区域和边缘区域的用户数量获知各个扇区的用户数量后，则根据所述各个扇区的用户数量以及基站的最大发射功率决定所述扇区的最大发射功率，然后将所述扇区的最大发射功率通知给基站；
A4、所述基站周期性地根据本扇区中心区域和边缘区域的用户数量或业务数量决定主副子载波功率比率，并根据所述扇区的最大发射功率、主副子载波功率比率和主副子载波的数量计算并得到主副子载波的发射功率。
其中，在所述步骤A2与步骤A3之间还包括:
A5、将中心区域的业务量与边缘区域的业务量进行比较，当确认边缘区域的业务量与中心区域的业务量之比大于1/N时，则选择本扇区内与其它扇区的副子载波发生重叠最少的副子载波，并提高其发射功率到主子载波的发射功率，使其转换为主子载波。
其中，所述步骤A1还包括:
为相邻的扇区选择不同的主子载波。
其中，在所述步骤A2之前还包括:
A21、RNC根据各个用户上报的信息获知所述用户属于用户所在扇区的中心区域还是属于边缘区域；
A22、根据所述获知到的所述用户属于用户所在扇区的中心区域或边缘区域的信息进行计算，得到一个扇区内中心区域和边缘区域的用户数量。
其中，所述步骤A21具体包括:
A211、用户计算自己是属于边缘区域还是属于中心区域，并将计算结果上报给RNC；RNC根据各个用户上报的信息获知所述用户属于用户所在扇区的中心区域还是属于边缘区域；
或，
A212、用户实时上报测量信息给RNC；RNC根据各个用户上报的测量信息计算并获知所述用户属于用户所在扇区的中心区域还是属于边缘区域。
其中，步骤A3中，在将决定的扇区的最大发射功率通知给基站的过程之前，还包括:
每隔一定的时间间隔，根据所述各个扇区业务状况对扇区的最大发射功率进行更新。
其中，所述步骤A4具体包括:
所述基站周期性地根据所述扇区内当前的边缘区域和中心区域的业务状况决定主副子载波功率比率，并根据所述扇区的最大发射功率、主副子载波功率比和主副子载波的数量计算并得到主副子载波的发射功率。
其中，所述步骤B具体包括:
B1、当用户进入某扇区时，基站将本扇区的主副子载波划分信息，以及主副子载波的发射功率发送给所述用户；
B2、当用户成功申请数据传输后，测量相邻扇区导频信号强度，并根据导频强度来确定其属于中心区域还是属于边缘区域，并选择相应的子载波的信道质量指示CQI值给基站；
或，
当用户成功申请数据传输后，将所有的子载波的CQI值上报给基站；
B3、基站根据用户上报子载波的CQI值、所述用户的优先级和用户的区域标识，以及相应的调度原则调度相应的子载波给对应的用户；
B4、基站与用户间基于所述子载波进行通信。
其中，在所述步骤B3之前包括:
基站通过测量的子载波的误比特率，将相应的误比特率比较高的子载波屏蔽掉。
其中，步骤B3中，所述调度原则具体包括；
对于边缘区域的用户，优先调度主子载波给所述用户；如果主子载波都被占用了，并且存在空闲的副子载波，则调度相应的副子载波给所述用户；在所有边缘区域用户中，优先级高的用户先被调度，相同优先级中根据所述用户上报的子载波的CQI值，选择CQI值最大的子载波进行调度；
以及，
对于中心区域用户，优先调度副子载波给所述用户；如果副子载波都被占用了，并且存在空闲的主子载波，则调度相应的主子载波给所述用户；在所有中心区域用户中，优先级高的用户先被调度，相同优先级中根据所述用户上报的子载波的CQI值，选择CQI值最大的子载波进行调度。
其中，所述多载波***包括:
包括正交频分多址OFDMA、多载波码分多址MC-CDMA、多载波直扩码分多址MC-DS-CDMA、多载波时分多址MC-TDMA或多频码分多址MT-CDMA***。
由上述本发明提供的技术方案可以看出，本发明所述的方法是在多载波***的方向天线模式下，通过网络规划由基站控制器RNC对每个扇区进行主副子载波的划分，并根据各个扇区的业务量确定每个扇区的最大发射功率，并通过基站确定相应的主副子载波的发射功率；然后基站与用户间基于分配的相应子载波进行通信。本发明基于方向天线模式下部署的多载波***对用户进行子载波分配，更符合实际***的要求，从而扩展性较好；另外，本发明给不同区域用户分配不同功率的子载波，并且由于不同区域子载波的重用率不同(中心区域重用率高，边缘区域重用率低)，从而能够提高频谱资源利用率；而且，本发明是根据扇区中中心区域和边缘区域用户数量确定主副子载波的功率比率，因此能够随着当前扇区的业务量进行调节。
附图说明
图1为背景技术中OFDM***的***框图；
图2为背景技术中时域频域二维扩展多载波***的***框图；
图3为背景技术中多载波***的总体框图；
图4为现有技术一中多载波技术在软频率复用方法下的组网示意图；
图5为本发明的提供的第一实施例的流程图；
图6为本发明中3扇区天线下软频率复用方案主子载波分配示意图。
具体实施方式
本发明提供一种软频率复用的方法，其核心为:在多载波***的方向天线模式下，通过网络规划由基站控制器RNC对每个扇区进行主副子载波的划分，并根据各个扇区的业务量确定每个扇区的最大发射功率，并通过基站确定相应的主副子载波的发射功率；然后基站与用户间基于分配的相应子载波进行通信。
本发明提供的第一实施例，如图5所示，包括:
步骤11、在多载波***的方向天线模式下，通过网络规划基站控制器(RNC)进行主副子载波的划分，并通过网络初始化来确定。
在对每个扇区的子载波进行划分时，遵循的原则如下:
将每个扇区中的子载波按照多载波***中的扇区数量分成相互不重叠的N组，并在每个扇区中，选择其中的一组作为本扇区的主子载波，其它的子载波作为本扇区的副子载波。
为了更有效的减少小区间的干扰，所遵循的原则还包括:相邻的扇区需要选择不同的主子载波。
假设如图6所示，每个小区分为三个扇区，每个扇区可以分配所有的子载波，假设全部子载波为300个，则将其中的100个子载波为主子载波，其余的作为副子载波。
使相邻扇区的主子载波相互正交，并分配给每个子载波唯一的逻辑编号，逻辑编号相同的子载波意味着它们是相同的子载波。
为方便描述，使用相同标识的子载波表示相同主子载波集合，不同的标识代表不同的主子载波集合。例如，在图6的中央小区，标识为A所在的扇区标记为sector1，标识为A表示逻辑编号为1号到100号的子载波集合，是该扇区主子载波集合，标识为B所在扇区标记为sector2，标识为B表示逻辑编号为101号到200号的子载波集合，是该扇区主子载波集合，标识为C所在的扇区标记为sector3，标识为C表示逻辑编号201号到300号的子载波集合，为该扇区主子载波集合。
步骤12、基站控制器(RNC)根据各个用户上报的信息获知所述用户属于用户所在扇区的中心区域还是属于边缘区域。
具体包括两种情况，其一为:
首先，用户计算自己是属于边缘区域还是属于中心区域，并将计算结果上报给RNC。
其中用户计算自己是属于边缘区域还是属于中心区域的过程具体为:
用户测量相邻扇区所属的基站的导频信号，选取最强的三个导频信号，用其中最强的导频信号强度除另两个导频信号强度之和，得到的值设为ρ′，与网络参数ρ(该参数在网络规划时确定，通过广播控制信息发送给用户，它决定内外区域的比例大小，该参数大于0，并且小于2)相比较，如果ρ′>ρ，则该用户属于边缘区域，否则该用户属于内部区域。
然后，RNC根据各个用户上报的信息获知所述用户属于用户所在扇区的中心区域还是属于边缘区域。
其二为:
首先，用户实时上报测量信息给RNC；然后，RNC根据各个用户上报的测量信息计算并获知所述用户属于中心区域还是属于边缘区域。
具体过程为:
用户测量相邻扇区所属基站的导频信号，上报给RNC，RNC选取最强的三个导频信号，用其中最强的导频信号强度除另两个导频信号强度之和，得到的值设为ρ′，与网络参数ρ(该参数在网络规划时确定，它决定内外区域的比例大小，该参数大于0，并且小于2)相比较，如果ρ′>ρ，则该用户属于边缘区域，否则该用户属于内部区域。
步骤13、RNC根据所述获知到的所述用户属于用户所在扇区的中心区域或边缘区域的信息进行计算，得到一个扇区内中心区域和边缘区域的用户数量。
步骤14、RNC根据中心区域或边缘区域的用户数量计算并得到各个扇区内的用户数量。
步骤15、RNC根据所述中心区域和边缘区域的用户数量获知各个扇区的用户数量后，则根据所述各个扇区的用户数量以及基站的最大发射功率决定所述扇区的最大发射功率，并且每隔一定的时间间隔，根据所述扇区内的业务状况对扇区的最大发射功率进行更新，然后将所述扇区的最大发射功率通知给基站。
例如，RNC首先计算所有扇区内用户数量的平均值，然后，用该平均值除以本扇区内的用户的数量，最后，将得到的商值乘该基站发射机的最大发射功率的一半，作为该扇区的最大发射功率，如果该值大于基站发射机的最大发射功率，则取基站发射机的最大发射功率作为该扇区的最大发射功率。
步骤16、所述基站周期性地根据各个扇区内当前的边缘区域和中心区域的用户数量或业务数量(可以从接纳控制得到该数值)决定主副子载波功率比率，并根据所述扇区的最大发射功率和主副子载波功率比计算并得到主副子载波的发射功率。
计算主副子载波功率比的过程如下:
RNC将各个扇区的边缘区域用户数和中心区域用户数告知它所在的基站；
各个基站用它所在扇区的总用户数量除以中心区域用户数量，将得到的值作为主副子载波功率比率。
或，
RNC将各个扇区的边缘区域用户数和中心区域用户数，以及各个用户进行不同类型业务的比例，告知它所在的基站；
各个基站根据所述获知的用户数量、业务种类以及不同类型业务的比例，计算并得到各个扇区的边缘区域用户数和中心区域的业务比例，然后用它所在扇区的总业务数量除以中心区域业务数量，将得到的值作为主副子载波功率比率。
利用如下的公式对主副子载波的发射功率进行计算:
Figure C200510115579D00161
Figure C200510115579D00162
步骤17、当用户进入某扇区时，基站将本扇区的主副子载波划分信息，以及主副子载波的发射功率发送给所述用户。
用户请求数据传输，如果RNC响应该申请，则用户申请成功，然后基站与用户间就可以进行通信过程，具体如下:
步骤18、当用户成功申请数据传输后，测量相邻扇区导频信号强度，并根据导频强度来确定其属于中心区域还是属于边缘区域，并选择相应的子载波的信道质量指示CQI值给基站；或，当用户成功申请数据传输后，将所有的子载波的CQI值上报给基站。
用户测量相邻扇区导频信号强度，根据导频强度来确定该用户属于中心区域还是属于边缘区域(既可以在空闲时也可以在数据传输时进行)，然后依据该用户是属于中心区域用户还是属于边缘区域决定是上报相应的主子载波还是上报相应的副子载波的CQI(信道质量指示)给基站，或者全部子载波的CQI值上报给基站。
步骤19、基站根据用户上报子载波的CQI值、所述用户的优先级和用户的区域标识，以及相应的调度原则调度相应的子载波给对应的用户。
所述调度原则具体包括:
对于边缘区域的用户，优先调度主子载波给所述用户；如果主子载波都被占用了，并且存在空闲的副子载波，则调度相应的副子载波给所述用户；在所有边缘区域用户中，优先级高的用户先被调度，相同优先级中根据所述用户上报的子载波的CQI值，选择CQI值最大的子载波进行调度；
以及，
对于中心区域用户，优先调度副子载波给所述用户；如果副子载波都被占用了，并且存在空闲的主子载波，则调度相应的主子载波给所述用户；在所有中心区域用户中，优先级高的用户先被调度，相同优先级中根据所述用户上报的子载波的CQI值，选择CQI值最大的子载波进行调度。
步骤20、基站与用户间基于所述子载波进行通信。
当通过下行链路传输数据时，基站根据所述子载波以及对应的功率发送数据给用户，同时用户接收数据。
当通过上行链路传输数据时，用户根据所述子载波以及对应的功率，发送数据给基站，同时基站接收数据。
本发明提供的第二实施例，其主要思想是:当边缘用户的业务量比较大时，例如，当边缘区域的业务量与中心区域的业务量之比大于1/N时(N为扇区的数目)，每个扇区可以将用于中心区域用户的副子载波的标称功率增加到主子载波的标称功率，并将其转化为主载波使用，使得它服务于边缘用户。
在具体实施过程中，其与第一实施例的不同之处在于:
区别1、在步骤13与步骤14之间还包括:
将中心区域的业务量与边缘区域的业务量进行比较，当确认边缘区域的业务量与中心区域的业务量之比大于1/N时，则选择本扇区内与其它扇区的副子载波发生重叠最少的副子载波，并提高其发射功率到主载波的发射功率，使其转换为主子载波。
具体分配过程如下:
将处于标识为A的扇区中的逻辑编号101到300的副子载波的标称发射功率提高到主子载波的标称发射功率，转变为主子载波来为用户服务，并将所述副子载波当作主子载波进行分配。
在将所述副子载波当作主子载波进行分配的过程中，对于逻辑编号101到200的子载波和逻辑编号201到300的子载波要从小逻辑号进行分配，并且编号101到200和编号201到300的子载波要交替进行。
例如，分配逻辑编号为101的子载波后，接着分配逻辑编号为201的子载波，然后再分配逻辑编号为102的子载波，接着再分配逻辑编号为202的子载波，等等如此交替进行分配。标识A表示的其它扇区也依据此原则进行。
将处于标识为B的扇区中的逻辑编号1到100和逻辑编号201到300的副子载波的标称发射功率提高到主子载波的标称发射功率可以转变为主子载波，来为用户服务，并将所述副子载波当作主子载波进行分配。
在将所述副子载波当作主子载波进行分配的过程中，对于逻辑编号为1到100的子载波要从小逻辑号开始进行分配，而201到300要从大逻辑编号开始进行分配，并且1到100和201到300也要交替进行。
例如，首先分配逻辑编号为1的子载波，接着分配逻辑编号为300的子载波，然后分配逻辑编号为2的子载波，接着再分配逻辑编号为299的子载波，如此交替进行分配等等。标识B表示的其它扇区也依次原则进行。
将处于标识为C的扇区中的逻辑编号为1到200的副子载波的标称发射功率提高到主子载波的标称发射功率，转变为主子载波，来为用户服务，并将副子载波当作主子载波进行分配。
在将副子载波当作主子载波进行分配的过程中，对于逻辑编号为1到100的子载波和逻辑编号为101到200的子载波，均要从大的逻辑编号开始进行分配，并且交替进行分配。
例如，首先分配逻辑编号为100的子载波，接着分配逻辑编号为200的子载波，然后分配逻辑编号为99的子载波，接着分配逻辑编号为199的子载波，如此交替进行分配，等等。
区别2、在第一实施例的步骤18中，仅仅包括如下内容:
当用户成功申请数据传输后，将所有的子载波的CQI值上报给基站。
其它与第一实施例中的相关内容雷同，不再详细描述。
本发明通过的第三实施例，是在本发明提供的第一、第二实施例的基础上，通过基站测量每个子载波的误比特率，在子载波分配或调度算法中避免使用误比特率比较高的子载波，从而能够获得更高的性能。
其与本发明提供的上两个实施例的不同之处如下:
在基站根据用户上报子载波的CQI值、用户的优先级和用户的区域标识，调度相应的子载波给用户的过程之前，还包括:
基站通过测量的子载波的误比特率，将相应的误比特率比较高的子载波屏蔽掉。
其它与第一实施例中的相关内容雷同，不再详细描述。
上述实施例中的多载波***包括:正交频分多址(OFDMA)、多载波码分多址(MC-CDMA)、多载波直扩码分多址(MC-DS-CDMA)、多载波时分多址(MC-TDMA)或多频码分多址(MT-CDMA)***。
由上述本发明提供的技术方案可以看出，本发明所述的方法是在多载波***的方向天线模式下，RNC对每个扇区进行主副子载波的划分，并根据各个扇区的业务比例确定每个扇区的最大发射功率，基站根据处于扇区中的中心区域和边缘区域用户数量，主副子载波的功率比例和该扇区的最大发射功率来确定相应的主副子载波的发射功率；然后基站与用户间基于相应的子载波的信息进行通信。本发明中，根据给不同区域用户发送不同功率的子载波，并且不同区域子载波的重用率不同(中心区域重用率高，边缘区域重用率低)，从而能够提高频谱资源利用率；而且，本发明是根据扇区中中心区域和边缘区域用户数量关系确定主副子载波的功率比率，因此能够随着当前扇区的业务量进行调节；基于方向天线模式下部署的多载波***对用户进行子载波分配，更符合实际***的要求，从而扩展性较好。
以上所述，仅为本发明较佳的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到的变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应该以权利要求的保护范围为准。

Claims (13)

1、一种方向天线模式下的软频率复用的方法，其特征在于，包括:
A、在多载波***的方向天线模式下，由基站控制器RNC对每个扇区进行主副子载波的划分，并根据各个扇区的业务量和基站的最大发射功率确定每个扇区的最大发射功率，并且每隔一定的时间间隔，根据所述扇区内的业务状况对扇区的最大发射功率进行更新，并通过基站确定相应的主副子载波的发射功率；
B、当用户进入某扇区时，将所述确定发射功率的主子载波或副子载波相应地分配给用户，基站与用户间基于分配的相应子载波进行通信。
2、根据权利要求1所述的方法，其特征在于，所述步骤A具体包括:
在多载波***的方向天线模式下，基站根据处于扇区中的中心区域和边缘区域用户数量或业务数量，主副子载波的功率比例和该扇区的最大发射功率来确定相应的主副子载波的发射功率。
3、根据权利要求1或2所述的方法，其特征在于，所述步骤A具体包括:
A1、在多载波***的方向天线模式下，基站按照多载波***中扇区数量N将每个扇区的子载波分成相互不重叠的N组，并选择其中的一组作为本扇区的主子载波，另外的子载波作为本扇区的副子载波；
A2、基站控制器RNC获取每一个扇区内中心区域和边缘区域的用户数量；
A3、当RNC根据所述中心区域和边缘区域的用户数量获知各个扇区的用户数量后，则根据所述各个扇区的用户数量以及基站的最大发射功率决定所述扇区的最大发射功率，然后将所述扇区的最大发射功率通知给基站；
A4、所述基站周期性地根据本扇区中心区域和边缘区域的用户数量或业务数量决定主副子载波功率比率，并根据所述扇区的最大发射功率、主副子载波功率比率和主副子载波的数量计算并得到主副子载波的发射功率。
4、根据权利要求3所述的方法，其特征在于，在所述步骤A2与步骤A3之间还包括:
A5、将中心区域的业务量与边缘区域的业务量进行比较，当确认边缘区域的业务量与中心区域的业务量之比大于1/N时，则选择本扇区内与其它扇区的副子载波发生重叠最少的副子载波，并提高其发射功率到主子载波的发射功率，使其转换为主子载波。
5、根据权利要求3所述的方法，其特征在于，所述步骤A1还包括:
为相邻的扇区选择不同的主子载波。
6、根据权利要求3所述的方法，其特征在于，在所述步骤A2之前还包括:
A21、RNC根据各个用户上报的信息获知所述用户属于用户所在扇区的中心区域还是属于边缘区域；
A22、根据所述获知到的所述用户属于用户所在扇区的中心区域或边缘区域的信息进行计算，得到一个扇区内中心区域和边缘区域的用户数量。
7、根据权利要求6所述的方法，其特征在于，所述步骤A21具体包括:
A211、用户计算自己是属于边缘区域还是属于中心区域，并将计算结果上报给RNC；RNC根据各个用户上报的信息获知所述用户属于用户所在扇区的中心区域还是属于边缘区域；
或，
A212、用户实时上报测量信息给RNC；RNC根据各个用户上报的测量信息计算并获知所述用户属于用户所在扇区的中心区域还是属于边缘区域。
8、根据权利要求3所述的方法，其特征在于，步骤A3中，在将决定的扇区的最大发射功率通知给基站的过程之前，还包括:
每隔一定的时间间隔，根据所述各个扇区业务状况对扇区的最大发射功率进行更新。
9、根据权利要求3所述的方法，其特征在于，所述步骤A4具体包括:
所述基站周期性地根据所述扇区内当前的边缘区域和中心区域的业务状况决定主副子载波功率比率，并根据所述扇区的最大发射功率、主副子载波功率比和主副子载波的数量计算并得到主副子载波的发射功率。
10、根据权利要求1或2所述的方法，其特征在于，所述步骤B具体包括:
B1、当用户进入某扇区时，基站将本扇区的主副子载波划分信息，以及主副子载波的发射功率发送给所述用户；
B2、当用户成功申请数据传输后，测量相邻扇区导频信号强度，并根据导频强度来确定其属于中心区域还是属于边缘区域，并选择相应的子载波的信道质量指示CQI值给基站；
或，
当用户成功申请数据传输后，将所有的子载波的CQI值上报给基站；
B3、基站根据用户上报子载波的CQI值、所述用户的优先级和用户的区域标识，以及相应的调度原则调度相应的子载波给对应的用户；
B4、基站与用户间基于所述子载波进行通信。
11、根据权利要求10所述的方法，其特征在于，在所述步骤B3之前包括:
基站通过测量的子载波的误比特率，将相应的误比特率比较高的子载波屏蔽掉。
12、根据权利要求10所述的方法，其特征在于，步骤B3中，所述调度原则具体包括:
对于边缘区域的用户，优先调度主子载波给所述用户；如果主子载波都被占用了，并且存在空闲的副子载波，则调度相应的副子载波给所述用户；在所有边缘区域用户中，优先级高的用户先被调度，相同优先级中根据所述用户上报的子载波的CQI值，选择CQI值最大的子载波进行调度；
以及，
对于中心区域用户，优先调度副子载波给所述用户；如果副子载波都被占用了，并且存在空闲的主子载波，则调度相应的主子载波给所述用户；在所有中心区域用户中，优先级高的用户先被调度，相同优先级中根据所述用户上报的子载波的CQI值，选择CQI值最大的子载波进行调度。
13、根据权利要求1或2所述的方法，其特征在于，所述多载波***包括:
正交频分多址OFDMA、多载波码分多址MC-CDMA、多载波直扩码分多址MC-DS-CDMA、多载波时分多址MC-TDMA或多频码分多址MT-CDMA***。
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