CN1072864C - 用于确定多用户通信系统中传输数据率的方法和设备 - Google Patents
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Abstract
一种用于控制一基台和多个远地用户之间通信数据率的和设备。对于无论是从基台至远地用户的前向链路资源还是从远地用户至基台的反向链路资源的通信资源使用率进行测量。将测得的使用率数值与至少一个预定阈值比较,并且根据所述比较结果改变所述通信资源的通信数据率或通信的用户数。
Description
发明背景
Ⅰ、发明领域
本发明涉及通信系统。尤其,本发明涉及一种新的、改进的方法和设备,它通过控制与多用户通信系统用户往来的数据传输率,使该多用户通信系统中用户的总平均业务质量最高。
Ⅱ、背景技术
“多址联接”(multiple access)一词是指由多个用户共享某一固定的通信资源。这种固定通信资源的典型例子是带宽。有三种基本方式来提高单个用户访问通信资源的通过率或数据率。第一种方法是增大发射器的发射功率或者减少系统损耗,从而提高所接收的信噪比(SNR)。第二种方法是增大分配给用户的带宽。第三种方法是更有效地分配通信资源。
一些为通信资源提供多址联接的更为通用的方法包含模拟和数字通信调制两种方案。这类方案包括频分、时分和扩展频谱技术。在频分多址(FPMA)技术中,分给每个用户一个或更多个特定的分频带。在时分多址(TDMA)技术中,要识别周期性重复的时隙,并且对每段时间,分配给每个用户一个或更多个时隙。在一些TDMA系统中,为用户固定分配了时间,而在另一些系统中,用户可以随时访问资源。在扩展频谱通信中,用户共享一个公共的频带。用跳频(FH)调制对载波作信号调制,使载波频率依预定方案改变。在直接序(directsequence)(DS)调制中,用伪随机码调制用户信号。在使用直接序扩展频谱调制的一种码分多址(CDMA)技术中,需识别一组正交的或近似正交的扩展频谱代码(每个代码使用全信道带宽),并分配给每个用户一个或多个特定的代码。
在所有的多址联接方案中,多个用户共享一个通信资源,在检测过程中不会产生难以处理的相互干扰。这种干扰的允许极限被定义为使所得传输质量仍位于预定的允许水平之上的干扰最大值。在数字传输方案中,通常由比特差错率(BER)或帧差错率(FER)来衡量质量。在数字电话通信系统中,总通话质量受到每个用户允许的数据率和BER或FER的限制。
已经开发了一些系统,它们能使话音信号所需的数据率减至最小,同时仍然提供容许的通信质量水平。如果话音是通过对模拟话音信号简单的抽样和数字化来传输,那么需要每秒64千比特(Kbps)数量级的数据率来获得与通常的模拟电话等价的话音质量。但,通过使用语言分析,然后进行适当的编码、传输,并在接收机处再合成,便可显著地减小数据率,并且质量下降最少。
用诸技术通过抽取与人类话音生成模型有关的参数来压缩话音的装置一般称为声码器(vocoder)。这种装置由一编码器和一译码器组成,其中编码器分析输入的话音以抽取相关的参数,而译码器用通过传输信道从编码器接收到的参数再合成话音。当话音变化时,确定新的模型参数并通过通信信道传输。通常把话音分成时间块或分析帧,在该期间计算参数。于是对每个新的帧都要更新参数。
一种实现数据压缩以减少所需发送信息的更好的技术是进行可变速率的话音信号编码处理。题为“可变速率声码器”的美国专利第5,414,796号详细描述了一例可变速率话音信号编码处理技术,该专利是1991年6月11日递交的第07/713,661号申请的继续,它已转让给本发明的受让人并通过引用包括在此。由于话音本来含有无声期,即停顿,所以可以减少表示这些时段所需的数据量。通过减小这些无声期的数据率可变速率话音信号编码处理最有效地利用这一事实。减小无声期的数据率而不是完全停止数据传输,这在减少被传输信息的同时克服了与话音激活选通(voice activity gating)有关的问题,从而减少了多址通信系统中的总干扰。
本发明的目的在于,为了最大限度地利用通信资源,改进可变速率声码器传输率的可变能力和任何其他可变速率数据源。
发明内容
本发明提供了一种新的、改进的方法和设备,它通过控制与多用户通信系统往来的数据传输率使该多用户通信系统中用户的总的平均业务质量最高。
在本发明中,监测可用通信资源的利用率。当可用通信资源的使用率对于所给的通信链路太大,并且由此质量下降至一预定极限以下时,那么就限制与用户往来的数据率,以释放一部分可用通信资源。当通信资源的利用率变小时,允许与用户往来的数据率升高到上述极限之上。
例如,如果从远地用户到主通信中心的通信链路(以下称为反向链路)过载,那么主通信中心发出一信令消息,请求用户(或被选出的用户)降低其平均数据传输率。在远地用户端,接收该信令消息,并根据该信令消息降低远地用户的传输率。
在该例中,远地用户可以正在传输话音数据或其他数字数据。如果用户正在传输话音数据,那么他的数据传输率可以如上述第5,414,796号专利所述那样用可变速率声码器来进行调节。当远地用户正在传输话音数据时,本发明同等地适用于任何可变速率话音信号编码策略。如果用户正在传输非话音数据的数字数据,那么系统可以有选择地命令用户为该特别的数字数据源修改传输的数据率。
在主通信中心和远地用户之间的通信链路(以下称为前向链路)上,主通信中心检测正用来与远地用户通信的资源占总资源容量的百分率。如果正在使用的通信资源百分率太大,那么主通信中心将降低每个用户或一个用户子集的被允许的平均数据传输率。如果正在使用的通信资源的百分率太小,主通信中心将允许每个用户增加平均数据率。当在反向链路中时,实质上可根据正被传送给远地用户的数据性质(话音的或非话音的)有选择地控制数据率。
附图概述
结合附图阅读以下叙述的详细描述,将更加清楚本发明的特点、目的和好处,其中相同的参考符号自始至终相对应地视为等同,附图有:
图1是一方框图,示出了多个远地(移动)用户访问一个主通信中心(蜂窝区基台)的情况;
图2是一方框图,示出了多蜂窝区(多个主通信中心)环境对远地(移动)用户的数据接收的影响;
图3是在特定的平均数据传输率下平均业务质量与用户数的关系曲线图;
图4是在三个不同的平均数据传输率下平均业务质量与用户数的关系曲线图;
图5是系统监视和控制操作的流程图;
图6是关于前向链路通信的通信资源饼式图(pie chart);
图7是关于反向链路通信的通信资源饼式图;
图8是一通信资源饼式图,示出了对于不同的资源使用率所要采取的措施;
图9是一通信资源饼式图,示出了用本发明的控制机理使数据率下降所依赖的条件;
图10是一通信资源饼式图,示出了降低上述通信资源数据率的效果;
图11是监视和控制系统的方框图,用于控制位于主通信中心处的反向链路通信;
图12是监视和控制系统的方框图,用于控制位于远地用户处的反向链路通信;和
图13是前向链路监视和控制设备的方框图。
本发明的最佳实施方式
图1示出了多用户通信系统在远地用户4和主通信中心2之间的通信。在该示例的实施例中,用码分多址(CDMA)多用户方案来进行通信,其中码分多址多用户方案在题为“使用地面中继器的卫星的扩展频谱多址联接通信系统(CDMA)”的第4,901,307号美国专利和题为“在CDMA蜂窝式电话系统中产生信号波形的系统和方法(CDMA)”的第5,103,459号美国专利中都有详细描述,这两个专利都已转让给本发明的受让人,并通过引用包括在此。从远地用户至主传输中心发生的通信被称为反向链路通信。能从远地用户4至蜂窝区基台2进行通信的通信链路称为反向链路。在CDMA系统中,系统用户容量是系统中干扰大小的函数。
图2说明了两个主要的源头,它们导致了对数据率进行控制以减少干扰并增大容量的需求。在例举的CDMA多蜂窝区的蜂窝式通信网的实施例中,对前向链路通信的主容量限制来自相邻蜂窝区的干扰,如从蜂窝区基台12画至单个远地用户的传播线所示。从单个蜂窝区基台至移动台10的第二条传播路径18表示本发明中对前向链路容量的第二种影响。这种称为多路径的影响的原因是由于障碍物16的反射,障碍物可以是建筑物、山或任何其他能够反射电磁波的物体。
在例示的实施例中,远地用户从并不与该远地用户通信的一些蜂窝区基台12接收到干扰,并且由来自障碍物16的多路径信号收到干扰。在该例中,一组蜂窝区的运行由系统控制器14监视,该控制器14向公用电话交换网(未示出)提供数据和由该网获得数据。这些通信被称为前向链路通信。
在如时令多址(TDMA)和频分多址(FDMA)系统中,分别由于有限个数的时隙或分频带的划分而存在着“硬”容量极限。当把所有的时隙或分频带都分配给用户时,达到“硬”容量极限,并且不可能再为任何附加的用户提供服务。尽管在达到容量极限前已经访问系统的用户不受任何被排除在外的用户的影响,但由于对每个被拒绝服务的附加用户的服务质量为零,所以对所有用户的平均业务质量下降得超出该容限。
在诸如CDMA(码分多址)和象ALOHA(一级随机存取协议)和有隙(slotted)ALOHA系统等随机存取系统的多址方案中,存在着“软”容限。对于这些类型的多址联接系统,系统用户数增长超出容限会使系统所有用户的业务质量下降。在CDMA系统中,每个用户的传输都被视为对每个其他用户的干扰或噪声。超过CDMA系统的软容限后,噪声本底(noise floor)变得足够大,从而使BER或FER超过预定的允许值。在随机存取方案中,每个附加的用户增加了消息冲突的可能性。超过容限后,消息冲突增加得如此频繁,以致对重新传输的需求或所致丢失的数据使所有用户的通信质量受损。
图3是这种多址联接通信系统中用户平均业务质量与占用该系统用户数的关系曲线图,所有用户都被赋予一规定的平均数据率。平均业务质量Qave定义为: 其中Qi是对于用户i的业务质量,而N是系统上的用户数。
图3还示出了一条质量线,在该线以上平均业务质量合格,而该线以下业务质量不合格。质量线与质量对用户数关系曲线的交点确定了在该系统数据率下系统的容限。在例举的CDMA系统实施例中,以20ms帧传输消息,而1%的容许帧差错率提出了本实施例中质量线的位置。可以理解,不同的帧长度和帧差错率都同样适用于本发明。
图4示出了三条平均业务质量与用户数的关系曲线20、22和24,它们分别对应三个逐渐下降的平均数据率。曲线20对应于平均数据率较高的质量曲线,曲线22对应于平均数据率适中的质量曲线,而曲线24对应于平均数据率较低的质量曲线。
曲线中第一个重要特征是,对于较低的链路数据率,曲线与垂直轴的交点逐渐降低。在容限以下,较高的许可数据率对应于较高的质量,因为较高的数据率可在可变速率话音编码器中使参数更精细地量化,从而获得更清晰的声音。
曲线中的第二个重要特征是质量线与三条曲线的交点。质量线与每条曲线20、22和24的交点提供了曲线20、22和24在各自数据率下的系统容限。用容量A、容量B和容量C标出的系统容量是在每条曲线20、22和24的数据率下可以访问系统的用户数。如图中所示,从曲线与质量线的交点向表示用户数的水平轴向下作一条垂线,便可获得所给数据率下的容限。对于一固定的质量水平,当数据率下降时,系统容量增加。
图5是一流程图,示出了通过控制系统上的数据传输率使平均质量最高的方法。在方框30,根据所给链路上访问系统的用户数和每个用户传输的数据率确定正在使用的通信资源量。把方框30中计算得的使用率值传至方框32。在方框32中,将使用率值与下限阈值作比较。若使用率值低于下限阈值,则操作行至方框34,确定链路是否在预定的最大数据率下工作。如果系统在预定的最大数据率下工作,则操作移至方框38,并且不进行任何动作。如果系统在低于预定最大数据率下工作,则操作行至方框36,并且增大链路数据率。
回到方框32,如果判断出链路使用率不太低,则操作行至方框40,将该使用率与上限阈值比较。如果在方框40中判断出链路使用率低于上限阈值,则操作行至方框41,并且不进行任何动作。另一方面,如果在方框40中链路使用率超过上限阈值,那么操作行至方框42。在方框42中,将系统数据率与预定的最小值比较。如果系统数据率大于该预定最小值,那么操作行至方框44,降低链路数据率。
如果在方框42判断出链路数据率等于最小链路数据率,则操作行至方框46。在方框46,系统将使用率与预定的使用率最大值比较。如果通信资源用尽,即,使用率等于预定的最大值,则操作行至方框48,并阻塞任何附加用户的访问。如果使用率低于预定使用率最大值,那么操作行至方框50,并且不进行任何动作。
在TDMA系统中,可以通过在多个分配的时隙间扩展某给定用户的数据或将多个用户的数据与选出的分配时隙组合来改变数据率。在另一种实践中,可通过把长度变化的时隙分配给不同的用户而在TDMA系统中获得可变的数据率。类似地,在FDMA系统中,可通过在多个分配的分频带间扩展某给定用户的数据或将多个用户的数据与选出的分配分频带组合来改变数据率。在另一种实践中,可通过把大小变化的分频带分配给不同的用户而在FDMA中获得可变的数据率。
在随机存取系统中,消息冲突的概率正比于每个用户需要发送的信息量。因此,可以通过发送大小变化的数据分组或在传输之间变化的时间间隔内发送数据分组来直接调节数据率。
在使用CDMA系统的实施例中,如上述第5,414,796号专利所描述的,用可变速率声码器调节传输话音所必需的数据量。实施例的可变速率声码器以相应于8Kbps、4Kbps、2Kbps和1Kbps的全速率、半速率、四分之一速率和八分之一速率提供数据,但基本上能够通过组合各数据率达到任何最大的平均数据率。例如,通过迫使声码器在每第四个连续的全速率帧时使用半速率而达到7Kbps的平均最大速率。在该例举的实施例中,如题为“数据子帧随机数发生器”的第07/846,312号美国专利申请所述,将大小变化的话音数据分组加以分段并在随机时刻提供这些分段,该专利申请已转让给本发明的受让人,并通过引用包括在此。
一种有用的察看通信资源容量结果的方法是把可用通信源视作一个饼式图,其中整个圆饼表示通信资源全部用尽。在这种表示中,饼式图的扇形表示分配给用户的资源百分率、系统开销和未用资源。
在TDMA或FDMA系统中,整个饼式图可以表示某一给定分配策略中可用时隙或分频带的数目。在随机存取系统中,整个饼图可以表示在消息冲突增长很大以致使传输链路不合格之前所允许的消息速率。在CDMA系统的实施例中,整个饼图表示可容许的最大噪声本底,其中在接收与远地用户往来的消息数据时,开销和来自所有其他用户的信号都作为噪声出现。参见图3,在任何系统结构中整个资源圆饼表示质量线与平均质量对用户数的关系曲线的相交。
图6例示了一普通前向链路容量的饼式图。资源圆饼的第一个扇形标有“开销”(overhead),表示不携有消息信息的传输信号部分。饼中“开销”的百分率表示传输非消息非用户特定数据,并且尽管在其他系统中该开销可以随用户数或其他因素而变化,但在本实施例中它是通信资源的一个固定百分率。“开销”可以包括基台识别信息、定时信息和基台建立信息及其他。“开销”可以包括通信资源的导频信道应用。在题为“在CDMA蜂窝式电话系统中产生信号波形的系统和方法(CDMA)”的第5,103,459号美国专利中详细描述了一例导频信道,该专利已转让给本发明的受让人,并通过引用包括在此。接下来标有数字1-20的每个扇形表示发向某特殊用户的消息信息,其中用户用1-20编号。沿顺时钟方向移动,饼的最后一个扇形标着“B”。标有“B”的扇形表示在发生不合格链路性能降低之前的剩余可用通信资源的百分率。
图7是反向链路通信的资源饼式图。该饼式图表示在主发射中心或基台接收到的来自远地用户的信息。该饼式图和上一饼式图之间的唯一明显的区别是,在反向链路中没有固定的“开销”资源。还应注意,在较佳实施例中,为了使对于所有用户的业务质量都最高,每个用户使用相同百分率的通信资源。在题为“用于在CDMA蜂窝式电话系统中控制传输功率的方法和设备”的第5,056,109号美国专利中详细描述了用于保持所有用户使用相同百分率的被接收通信资源状态的方法和设备,该专利已转让给本发明的受让人,将它通过引用包括在此。在这种方法中,每个远地用户以某一功率电平发射,从而使基台接收到的情况与所有其他远地用户的一样。最好是,每个远地用户以能够确保与基台建立合格通信链路所必需的最小功率电平发射。
图8是一动作为饼式图,表示相对于资源饼式图而采取的动作。在图8饼式图上作了三点标记,一点表示“增高速率”,一点表示“降低速率”,再一点表示“阻塞额外用户”。如果对于某一给定的链路,资源圆饼的百分率超过标有“降低速率”的点,则应该降低该链路上的传输速率,以提高对于用户的业务质量。例如,如果所有的用户都以图4中与曲线20相应的数据率传输,并且用户数大于容量A,那么将降低数据率,然后系统依照图4中曲线22工作。如果对于某个给定的链路,资源圆饼百分率下降至标有“增高速率”的点以下,则应该增高该链路上的传输速率,以提高对于用户的业务质量。例如,如果所有用户都在以图4中与曲线22相应的数据率传输,并且用户数降至容量A以下,那么将增大数据率并且系统依照图4中的曲线20工作。如果圆饼达到标有“阻塞额外用户”的点,那么应该阻塞任何额外用户访问该系统。注意,系统达到“阻塞额外用户”点的唯一途径是通过“降低速率”点,这意味着速率不能再降低了。
图9和10示出了降低传输速率对资源分配的影响。在图8中,添加用户20已使资源分配超过了应使传输速率降低的点。在该点,降低传输速率,并且对于相同的用户资源饼看上去如图9。注意,标有B的资源饼未用部分足够大,可使额外的用户访问通信资源。因此,额外用户可以访问通信系统,直至系统再次要求降低传输速率。继续该过程直至速率为最小值。如果发生这种情况,系统允许圆饼完全充满,并且不许任何新用户访问系统。
相反,当用户离开通信资源时,所用的通信资源百分率会降至“增高速率”点以下,并且系统将增高传输速率。这个过程可延续至传输速率被增高到最大值或直到没有用户正在访问通信资源。
图11示出了一方框图,用以在主通信中心对反向链路通信资源的使用进行监视和控制,它可以包括蜂窝区基台和系统控制器。来自远地用户的信号在接收天线60处被接收。接收到的信号被提供给接收机62,接收机把数据以模拟或数字的形式提供给能量计算部件66和解调器64。将能量计算部件66计算得到的能量值提供给速率控制逻辑器68,逻辑器把接收到的信号能量与一系列阈值比较。根据比较结果,当信号能量高于上限阈值或低于下限阈值时,速率控制逻辑器68把速率控制信号提供给微处理器70。在另一些实施例中,速率控制逻辑器68还能受影响通信信道性能的外部因素(比如天气条件等)的影响。
把从接收机62接收到的信号提供给解调器64,在解调器中解调该信号,并且抽取特定用户的数据,然后把数据提供给相应的微处理器70。在本实施例中,如在题为“用于在CDMA蜂窝式电话系统的通信中提供软切换的方法和系统”的第5,056,109号美国专利(已转让给本发明的受让人,并通过引用包括在此)中所描述的那样,微处理器70将接收到的数据提供给系统控制器14中的选择器卡(未示出),该系统控制器从来自多个主通信中心(蜂窝区)的接收到的数据中选择一最佳的接收到的数据,每个主通信中心(蜂窝区)包含接收机62和解调器64,并且用声码器(未示出)对该最佳接收到的数据译码。
另外,微处理器70通过数据接口从诸声码器(未示出)接收前向链路传输的数据。当存在反向链路速率控制信号时,微处理器70将它与输出的前向链路数据合并,以把混合数据分组提供给调制器72。在一较佳实施例中,当出现反向链路速率控制信号时,微处理器70将有选择地把该信号与输出的前向链路数据合并。在该较佳实施例中,微处理器70对指出过负荷状态的信号有反应,在过负荷状态下,反向链路速率控制信号不与输出的前向数据合并。在另一个实施例中,某些所述的微处理器70将不对反向链路速率控制信号作出反应。调制器72调制数据分组并把已调制的信号提供给累加器74。累加器74对已调制的数据进行累加,并把累加结果提供给发射机76,在发射机76中放大并把它提供给发射天线78。
图12是一方框图,示出了本发明用于响应图1中主发射中心2的实施例所提供的速率控制信号的远地用户设备。在接收路径上,由天线90接收包含有编码话音数据和/或信令数据的信号,天线90还通过天线收发转换开关92用作发射天线。接收到的信号通过天线收发转换开关92传给解调器96。然后解调该信号,并将它提供给微处理器98。接下来,微处理器98对信号译码并把话音数据和基台发送的任何速率控制数据传给可变速率声码器100。然后,可变速率声码器100对微处理器98提供的话音数据已编码的分组进行译码,并将译码后的话音数据提供给编码译码器102。编码译码器102将数字话音信号转换成模拟形式,并把模拟信号提供给扬声器106放音。
在远地用户的发射路径上,话音信号是通过送话器106提供给编码译码器102的。编码译码器102将话音信号的数字表示提供给可变速率声码器100,在实施例中可变速率声码器100根据话音活动(speech activity)和接收到的速率信号所确定的速率对话音信号编码。然后将这个已编码的话音数据提供给微处理器98。
在本实施例中,速率控制信号是一个指示远地用户增高或降低最大数据率的二进制信号。这种对数据率的调节是按分立的等级进行的。在本实施例中,当接收到蜂窝区基台的速率控制信号时,远地用户将增高或降低其最大发射速率1000bps。实践中,因为在正常的双向对话中声码器最多只是用40-50%的时间对话音编码,所以这使总的平均数据率降低了400至500bps。在本实施例中,总是以较低的数据率对字间的无声编码。
例如,如果远地用户目前正在以全速率或速率1(8Kbps)的最大数据传输率工作,并且接收到一个要求降低其最大数据率的信号,则最大数据传输率将通过对数据的每第四个连续的全速率数据帧进行强制用半速率(4Kbps)编码而被降低至7/8(7Kbps)。另一方面,如果远地用户正在蜂窝区基台的控制下以最大传输率的3/4(6Kbps)工作,并且蜂窝区基台给远地用户发信号,要求增高其最大数据率,那么远地用户将把7/8速率(7Kbps)用作最大数据传输率。在一简化的实施例中,可简单将各速率限制为可变速率声码器100所提供的分立速率中的一个(即1、1/2、1/4和1/8速率)。
微处理器98还接收非话音数据,这些数据包括信令数据或诸如传真、调制解调器或其他需要与蜂窝区基台通信的数字数据的次级数据。如果远地用户发送的数字数据形式不与可变速率传输的一致(即一些传真或调制解调器数据),那么微处理器可以根据远地用户的业务选项决定是否依照速率控制信号改变传输速率。
调制器108调制该数据信号并把调制后的信号提供给发射机110,在发射机110,调制后信号被放大并通过天线收发转换开关92提供给天线90,通过大气发向基台。还可在本发明中预见到,远地用户可以监视反向链路通信资源,并以开环方式响应,从而调节其传输速率。
图13示出了一例前向链路速率控制设备的方框图。话音数据被提供给声码器120,声码器120以可变速率对该话音数据进行编码。在本发明中,当话音出现时,根据话音活动和速率控制信号确定对话音数据的编码速率。然后将已编码的话音提供给微处理器122,其中微处理器122还可从外源(未示出)接收非话音数据。这种非话音数据可以包括信令数据或次级数据(诸如传真、调制解调器或其他用于传输的数字数据)。然后,微处理器122把数据分组提供给调制器124,调制器124对数据分组进行调制并将它们提供给累加器126。累加器126累加来自调制器124的已调制信号,并将和信号提供给发射机128,在发射机128中,将该信号与一载波信号混合,放大并提供给天线130,以供传输。
经累加器126累加的已调制信号还被提供给能量计算器132。能量计算器132在一固定的时间间隔中计算来自累加器126的信号的能量,并把该能量估算值提供给速率控制逻辑器134。速率控制逻辑器134把能量的估算值与一系列的阈值作比较,并根据这些比较提供一速率控制信号。把速率控制信号提供给微处理器122。微处理器122将速率控制信号提供给声码器120,以控制话音数据的最大数据率。可选择地,微处理器122还能用速率控制信号控制非话音数据源(未示出)的数据率。可将速率控制信号有选择地提供给微处理器122,也可以选择微处理器122对一整体提供的速率控制信号作出响应。
上述在前向链路上的开环形式的控制还可在闭环中进行,它可以对来自远地台的表示达到容限的信号(诸如帧差错率太高或其他可测量量)作出响应。速率控制逻辑器134可以对同样影响通信信道性能的各种外部干扰作出反应。
上述对较佳实施例的描述可使本领域的熟练技术人员实现或应用本发明。对于本领域的熟练技术人员来说,对这些较佳实施例的各种改变将是显而易见的,而且不需要使用创造技能就能将这里确定的一般原理应用到其他实施例中。因此,不打算将本发明限制于文中所示的实施例,而应给予与此处所揭示的原理和新特征相一致的最大范围。
Claims (40)
1.一种在多个远地用户以反向链路数据传输率与一个通信中心交流消息信号的通信网中,根据系统使用率和容量来优化通信质量的子系统,其中每个远地用户都拥有一个发射机,通信中心具有一个接收机,所述子系统的特征在于,包括:
监测装置,用于确定所述系统的使用率,并且根据所述系统使用率有条件地提供一个反向链路速率控制信号;和
多个响应装置,每个响应装置与所述远地用户中对应的一个用户配置,用于接收所述反向链路速率控制信号,并根据所述反向链路速率控制信号调节所述远地用户中所述对应用户的实时消息信息帧的所述反向链路数据传输率。
2.如权利要求1所述的子系统,其特征在于,所述监测装置被配置给所述通信中心,所述子系统还包括:
通信中心发射装置,它将消息发送给所述远地用户并将所述速率控制信号发送给所述远地用户;和
多个远地接收装置,所述多个远地接收机的每一个都被配置给所述远地用户中的一个对应用户,用于接收所述速率控制信号并将所述速率控制信号提供给所述响应装置中的一个对应装置。
3.如权利要求1所述的子系统,其特征在于,所述监测装置通过在一段预定的时间间隔内对所述消息信号的能量测量来确定所述系统的使用率。
4.如权利要求1所述的子系统,其特征在于,所述响应装置包括:
处理器装置,用于接收所述速率控制信号并根据所述速率控制信号提供速率指令信号;和
可变速率声码器装置,用于接收话音数据和所述速率指令信号,并根据所述指令信号以某一速率对所述话音数据进行编码。
5.如权利要求4所述的子系统,其特征在于,所述可变速率声码器装置还根据所述话音数据的能量对所述话音数据进行编码。
6.如权利要求4所述的子系统,其特征在于,所述处理器装置还用于接收传输用的非话音数据,并根据所述速率控制信号以某一速率提供所述非话音数据。
7.如权利要求1所述的子系统,其特征在于,
所述监测装置包括:
能量计算单元,用于确定所述系统使用率;和
速率控制逻辑单元,它根据所述使用率的大小有条件地提供一个速率控制信号,致使如果系统使用率被确定为大于预定大小,则使用较低的数据率;并且
所述多个响应装置包括:
多个编码器,它们被配置给所述远地用户,用于根据所述速率控制信号对消息编码;和
多个扩展频谱发射机,用于根据扩展频谱调制格式发送消息。
8.如权利要求7所述的子系统,其特征在于,所述能量计算单元被配置给所述传输中心,所述子系统还包括:
通信中心发射机,它根据所述扩展频谱调制格式将消息发送给所述远地用户,并将所述速率控制信号发送给所述远地用户;和多个远地接收机,所述多个远地接收机的每一个都被配置给所述远地用户中的一个对应用户,用于根据所述扩展频谱的解调格式接收所述速率控制信号。
9.如权利要求7所述的子系统,其特征在于,所述监测装置通过在一段预定的时间间隔内对所述消息信号的能量测量来确定所述系统的使用率。
10.如权利要求7所述的子系统,其特征在于,所述接收机包括:
处理器,用于接收所述速率控制信号并根据所述速率控制信号提供速率指令信号;和
可变速率声码器,用于接收话音数据和所述速率指令信号,并根据所述指令信号以某一速率对所述话音数据进行编码。
11.如权利要求10所述的子系统,其特征在于,所述可变速率声码器还根据所述话音数据的能量对所述语音数据进行编码。
12.如权利要求10所述的子系统,其特征在于,所述处理器还用于接收传输用的非话音数据,并根据所述速率控制信号以某一速率提供所述非话音数据。
13.一种在通信系统中使用的远离基台的设备,在通信系统中,所述基台发射与系统使用率和容量有关的反向链路速率控制指令,其特征在于,所述设备包括:
接收机,用于接收包含消息数据和所述反向链路速率控制指令的信号;
可变速率声码器,用于接收实时话音数据帧并根据所述反向链路速率控制指令对所述实时话音数据帧进行编码;和
发射机,用于发送所述已编码的实时话音数据帧。
14.如权利要求13所述的设备,其特征在于,还包括:
解调器,位于所述接收机和所述可变速率声码器之间,用于解调所述接收到的信号;和
处理器,位于所述解调器和所述可变速率声码器之间,用于接收所述已解调的信号并分开提供所述消息数据和所述速率控制指令。
15.如权利要求14所述的设备,其特征在于,所述处理器还用于接收传输用的非话音数据。
16.如权利要求13所述的设备,其特征在于,进一步包括调制器,它位于所述可变速率声码器和所述发射机之间,用于调制所述已编码的话音数据。
17.如权利要求14所述的设备,其特征在于,还包括调制器,它位于所述可变速率声码器和所述发射机之间,用于调制所述已编码的话音数据。
18.如权利要求13所述的设备,其特征在于,
所述接收机是一个扩展频谱接收机,它根据扩展频谱解调格式接收包含消息数据的信号;并且
所述发射机根据扩展频谱调制格式发送所述已编码的实时话音数据帧。
19.如权利要求18所述的设备,其特征在于,还包括:
扩展频谱解调器,位于所述接收机和所述可变速率声码器之间,用于根据扩展频谱解调格式解调所述接收到的信号;和
处理器,位于所述扩展频谱解调器和所述可变速率声码器之间,用于接收所述已解调的信号并分开提供所述消息数据和所述速率控制指令。
20.如权利要求19所述的设备,其特征在于,所述处理器还用于接收传输用的非话音数据。
21.如权利要求18所述的设备,其特征在于,进一步包括调制器,它位于所述可变速率声码器和所述发射机之间,用于调制所述已编码的话音数据。
22.如权利要求19所述的设备,其特征在于,还包括调制器,它位于所述可变速率声码器和所述发射器之间,用于调制所述已编码的话音数据。
23.一种在基台中用于控制所述基台用户容量的设备,其特征在于,包括:
使用率确定装置,用于测量所述基台的使用率;
速率控制装置,将所述测得的使用率与至少一个预定值比较,并根据所述比较结果有选择地提供一实时消息反向链路速率控制信号;和
发射装置,用于发射所述实时消息反向链路速率控制信号。
24.如权利要求23所述的设备,其特征在于,还包括处理器装置,用于接收传输给所述远地用户的消息数据和所述实时消息反向链路速率控制信号,并将所述消息数据与所述实时消息反向链路速率控制信息合并以提供一个混合数据分组。
25.如权利要求24所述的设备,其特征在于,还包括一调制器装置,它位于所述处理器装置和发射机之间用于调制所述混合数据分组。
26.如权利要求23所述的设备,其特征在于,
所述使用率确定装置包括一能量计算单元,用于确定所述基台的使用率;
所述速率控制装置包括一比较器,它将所述测得的使用率与一预定值比较,并且根据所述比较结果有选择地提供一速率控制信号,当所述测得的使用率大于所述预定值时,所述速率控制命令降低数据率;并且
所述发射机根据扩展频谱调制格式发送所述速率控制信号。
27.如权利要求26所述的设备,其特征在于,还包括处理器,用于接收传输给所述远地用户的消息数据和所述速率控制信号,并将所述消息数据与所述速率控制信息合并以提供一个混合数据分组。
28.如权利要求27所述的设备,其特征在于,还包括一扩展频谱调制器,它位于所述处理器和发射机之间,所述调制器根据所述扩展频谱调制格式调制所述混合数据分组。
29.一种基台在前向链路上与多个远地用户交流消息的通信系统中,用于控制所述消息通信数据率的设备,其特征在于,包括:
使用率确定装置,用于确定所述前向链路的使用率值;
速率控制逻辑装置,用于接收所述使用率值,将所述使用率值与至少一个预定阈值比较并根据所述比较结果有条件地提供一速率控制信号;和
可变速率数据源装置,用于接收实时消息并把所述实时消息编码成为多个传输帧,其中所述可变数据源装置响应所述速率控制信号,以一减小的编码速率对所述多个传输帧的一个子集进行编码,同时以一较高的编码速率提供所述多个传输帧中其他帧。
30.如权利要求29所述的设备,其特征在于,所述可变速率数据源装置包含至少一个以可变速率对话音数据进行编码的可变速率声码器装置。
31.如权利要求29所述的设备,其特征在于,所述使用率确定装置测量信号能量,而所述信号传输给所述远地用户。
32.如权利要求29所述的设备,其特征在于,
所述使用率确定装置包括一能量计算单元,用于确定所述前向链路的使用率的值;并且
所述可变速率数据源装置依照扩展频谱调制格式,根据所述速率控制信号,以某一速率发送所述多个传输帧。
33.如权利要求32所述的设备,其特征在于,至少一个可变速率数据源包含至少一个以可变速率对话音数据进行编码的可变速率声码器。
34.如权利要求32所述的设备,其特征在于,所述使用率确定装置测量传输给所述远地用户的信号能量。
35.一种用于优化通信资源使用率的方法,其特征在于,包括下列步骤:
测量所述通信资源的所述使用率;
将所述测得的使用率与至少一个预定阈值比较;
根据所述比较结果产生一速率控制信号;和
根据所述比较结果调节所述通信的通信数据率。
36.如权利要求35所述的方法,其特征在于,将所述测得的使用率与至少一个预定阀值比较的所述步骤包括将所述使用率与一预定的较高使用率阈值比较,并且对所述通信资源的通信数据率进行调节的所述步骤包括当所述使用率超过所述较高使用率阈值时降低通信数据率。
37.如权利要求35所述的方法,其特征在于,将所述测得的使用率与至少一个预定阈值比较的所述步骤包括将所述使用率与一预定的较低使用率阈值比较,并且对所述通信资源的通信数据率进行调节的所述步骤包括当使用率下降至所述较低使用率阈值以下时增大通信数据率。
38.如权利要求35所述的方法,其特征在于,所述通信资源是扩展频谱通信资源,测量所述通信资源之所述使用率的所述步骤包括测量被接收到的扩展频谱信号之接收能量以确定所述使用率的步骤,并且根据扩展频谱调制格式发送多个传输帧。
39.如权利要求38所述的方法,其特征在于,将所述测得的使用率与至少一个预定阀值比较的所述步骤包括将所述使用率与一预定的较高使用率阈值比较,并且对所述通信资源的通信数据率进行调节的所述步骤包括当所述使用率超过所述较高使用率阈值时降低通信数据率。
40.如权利要求38所述的方法,其特征在于,将所述测得的使用率与至少一个预定阈值比较的所述步骤包括将所述使用率与一预定的较低使用率阈值比较,并且对所述通信资源的通信数据率进行调节的所述步骤包括当使用率下降至所述较低使用率阈值以下时增大通信数据率。
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