CN1783742B - 用于选择性地分配带宽的设备和方法 - Google Patents
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Abstract
一种CDMA无线数字通信系统,使用最小带宽为特定应用提供所有类型的话音和数据通信。该系统根据用户请求有效地分配ISDN带宽。根据用户初始化,系统建立信道并生成必需的扩展码以支持用户单元所需的最高容量信道。不预留部分通信频谱带宽直到用户单元实际请求。因为在来自用户单元的呼叫开始时执行呼叫建立,包括扩展码的分配,用户单元可快速地获得支持特定应用所需的部分频谱。
Description
本申请是申请日为1998年5月26日,申请号为98806254.2,发明名称为“根据请求选择性地分配带宽的码分多址通信系统”的中国专利申请的分案申请。
相关申请的交叉引用
本申请是1997年6月16日提交的临时申请No.60/049,637的部分后续申请。
技术领域
本申请一般涉及无线通信系统。更具体地,本申请涉及无线数字码分多址(CDMA)通信系统,该系统包括基站和多个用户并根据用户单元请求或希望与用户单元建立通信的实体的请求选择性地分配带宽。
背景技术
随无线通信系统容量和可靠性的提高,电信工业对无线电技术的应用已显著地增长。曾经仅看作是一种发送话音通信的方便方法的数字无线通信系统现在是提供所有形式的通信传输所必需的,所述通信包括简易老式电话业务(POTS)、综合业务数字网(ISDN)、可变比特率(VBR)数据业务、宽带业务、专线业务和分组数据业务。尽管传输上述所有类型的业务在技术上是可行的,但是高数据速率通信所需的大量带宽已使这些业务中的多种业务变得不经济。因为要求接入无线数字通信系统的用户数目已经增加,对于每种通信依靠宽带宽已经不现实。
分配给无线通信系统用于公用的有限带宽已逐渐升值。因为不可 能为现有应用分配支持用户增加的额外带宽,电信软硬件和软件中的许多新发展已致力于使用更窄的带宽而增加数据传输速率。
因此,需要一种更有效地使用所分配带宽并支持与常规有线网络相同的高数据速率业务的无线数字通信系统。
发明内容
本发明是一种CDMA无线数字通信系统,该系统使用最窄带宽为特定应用提供所有类型的话音和数据通信。该系统根据用户请求有效地分配ISDN带宽。根据用户初始化,系统建立信道并生成必需的扩展码以支持用户单元所需的最高容量信道。然而,在用户单元实际请求之前系统并不闲置部分通信带宽。因为在来自该特定用户单元的任一呼叫开始时执行呼叫建立,包括扩展码的分配,用户单元可快速地获得支持特定应用所需的部分频谱。
因此,本发明的目的是提供一种无线数字扩频通信系统,该系统有效地使用扩频带宽,支持包括POTS和ISDN的多种电话业务。
在理解下述优选实施例的说明之后,本发明的其它目的和优点将变得更明显。
附图说明
图1是根据本发明的码分多址扩频通信系统的方框图;
图2A是本发明用户单元与ISDN终端之间接口的方框图;
图2B是本发明用户单元与POTS终端之间接口的方框图;
图2C是本发明用户单元与分组终端之间接口的方框图;
图2D是本发明用户单元与宽带连接之间接口的方框图;
图2E是本发明用户单元与专线终端之间接口的方框图;
图2F是本发明用户单元与ISDN和POTS网络之间接口的方框图;
图2G是本发明用户单元与宽带和分组网络之间接口的方框图;
图2H是本发明用户单元与专线网络之间接口的方框图;
图3是根据本发明用户单元的方框图;
图4是根据本发明RCS的方框图;
图5是为ISDN业务动态分配带宽的程序流程图;
图6A和6B是为POTS业务在用户单元和RCS之间建立承载信道的流程图;
图7表示用户单元和RCS之间通信的分层协议;
图8A图示由用户单元始发的简化载体转换方法;
图8B图示由RCS始发的简化载体转换方法;和
图9A和图9B是为ISDN业务在用户单元和RCS之间建立承载信道的流程图。
具体实施方式
将参见附图说明优选实施例,在全部附图中同一标号表示同一部件。
本发明的系统使用一个或多个基站与至少一个远程用户单元之间的无线电链路提供本地环路电话业务。在示范实施例中,该无线电链路被描述成用于一个固定用户单元(FSU)与一个基站间的通信,但该系统可同样适用于包括多个基站的系统,所述基站具有到固定用户单元和移动用户单元(MSUs)的无线电链路。因此,固定和移动用户单元在此将称作用户单元。
参见图1,基站101向本地交换机103或任何其它电话网交换接口例如用户交换机(PBX)提供呼叫连接,并包括至少一个无线电载波站(RCS)104、105、…、110。一个或多个RCS104、105、110通过链路131、132、137、138、139连接到无线电分配单元(RDU)102,RDU
102通过经电话公司链路141、142、150发送和接收呼叫建立、控制和信息信号与本地交换机103对接。用户单元116、119通过无线电 链路161、162、163、164、165与RCS104通信。可选地,本发明的另一实施例包括若干用户单元和功能类似于RCS104的“主用户单元”。这样一种实施例可以有也可以没有到本地电话网的连接。
无线电链路161至165在CDS1800标准(1.71-1.785GHz和1.805-1.880GHz)、US-PCS标准(1.85-1.99GHz)和CEPT标准(2.0-2.7GHz)的频带内工作。虽然在所述实施例中使用这些频带,但本发明可同样适用于包括整个UHF和SHF频带和从2.7GHz到5GHz频带的所有射频频带。发射和接收带宽分别是开始于7GHz的3.5MHz的倍数和开始于10MHz的5MHz的倍数。所述系统包括7、10、10.5、14和15MHz的带宽。在本发明的示范实施例中,上行链路和下行链路之间的最小防护频带是20MHz,并希望至少是信号带宽的三倍。双工间隔在50到175MHz之间,所述发明使用50、75、80、95和175MHz。也可以使用其它频率。
虽然该系统可以使用以一载波为中心的不同扩频带宽用于发射和接收扩频信道,但本发明很容易扩展到使用多个扩频带宽用于发射信道和多个扩频带宽用于接收信道的系统。可选地,可以使用同一扩频带宽用于发射和接收信道,其中上行链路和下行链路将占用同一频带。本发明也很容易扩展到多个CDMA频带,每个频带传送各不相同的一组消息、上行链路、下行链路或上行和下行链路。
使用四相相移键控(QPSK)调制和奈奎斯特(Nyquist)脉冲整形在无线电链路161至165上传输扩展二进制码元信息。然而,也可以使用其它调制技术,包括但并不仅限于偏置QPSK最小频移键控(MSK)、高斯相移键控(GPSK)和M进制相移键控(MPSK)。
无线电链路161至165结合宽带码分多址(B-CDMATM)技术作为上行链路和下行链路方向上的传输模式。在多址系统中使用的CDMA(也称作扩频)通信技术是公知的,并由Donald Schilling在标题 为同步扩频通信系统和方法的美国专利US5,228,056中描述。所述系统使用直接序列扩展技术。CDMA调制器生成可以是伪噪声序列的扩频扩展码序列,并使用扩展码序列为同相(I)和正交(Q)信道执行QPSK信号的复数直接序列调制。生成导频信号,即未用数据调制的扩展码,并与调制信号一起发送。导频信号用于同步、载波相位恢复并用于估计无线电信道的脉冲响应。每个用户单元111-118包括编码生成器和至少一个CDMA调制器和解调器,两者共同组成CDMA调制解调器。每个RCS104、105、110具有至少一个编码生成器加足够的CDMA调制器和解调器用于用户单元使用中的所有逻辑信道。
CDMA解调器使用合理处理来解扩信号以降低或消除多径传播效应。无线电链路支持数据速率为8、16、32、64、128和144kb/s的多条业务信道。与业务信道连接的物理信道以64k码元/秒的速率工作。可以支持其它的数据速率并且可以使用向前纠错(FEC)编码。对于所述实施例,使用1/2编码速率和约束长度为7的FEC。根据所用的编码生成技术可以使用其它速率和约束长度。
再次参见图1,RCS104通过多条RF链路或例如1.533Mb/s DS1、2.048Mb/s E1的地面链路131、132、137或HDSL格式与RDU102对接以接收和发送数字数据信号。虽然这些是典型的电话公司标准接口,但本发明并不仅限于这些数字数据格式。示范的RCS线路接口(图1中未示)将线路编码(例如HDB3、B8ZS、AMI)译码并提取或生成帧信息,执行报警和业务信令功能以及信道专用环回和奇偶校检功能。这为RCS104、105、110提供用于处理的64kb/s PCM编码或32kb/sADPCM编码电话业务信道或ISDN信道,下文将作更详细的说明。根据序列生成技术可以使用其它话音压缩技术。
本发明的系统还为POTS业务和ISDN业务支持RCS104和用户单元111之间的载体速率修改。用户单元111-118可以与图2A-2E中所示的电话单元170、本地交换机(PBX)171、数据终端172、ISDN 接口173或其它类型的设备对接。来自电话单元170的输入可包括话音、话音频带数据和信令。虽然本发明可适用于多个用户单元111-118和多个RCS104-110之间的通信,为简便起见下文将参考一个特定用户单元和RCS。如果输入用户单元的信号不是数字的,用户单元111将模拟信号转换成数字序列以传输给RCS104。用户单元使用诸如ADPCM技术以32kb/s或更低的速率将话音数据编码。RCS104检测速率高于4.8kb/s的话音频带数据或传真数据以修改业务信道载体速率用于未编码传输。在传输之前可执行信号的A律、u律压扩或者不执行。正如本领域技术人员所公知的,用于数字数据的数据压缩技术例如空闲标志删除也可以用于节省容量和最小化干扰。
为下行链路和上行链路方向使用不同的闭环功率控制方法控制RCS104和用户单元111之间无线电接口的发射功率电平。自动前向功率控制(AFPC)方法确定下行链路发射功率电平和自动反向功率控制(ARPC)方法确定上行链路发射功率电平。用户单元111和RCS104用于传输功率控制信息的逻辑控制信道以至少16kHz的更新速率工作。其它实施例可使用更快或更慢的更新速率,例如64kHz。这些算法确保用户发射功率保持在可接收的误码率(BER),维持最小系统功率以节省功率并使用户单元111的功率电平保持在与RCS104所接收的近似相等的电平上。
在用户单元111的待用模式中本系统还使用可选的维护功率控制方法。当用户单元111待用或关机以节省功率时,有时响应来自RCS104的维护功率控制信号用户单元111启动以调整其初始发射功率电平设置。由RCS104通过测量用户单元111的接收功率电平和本系统的功率电平并计算必需的初始发射功率来确定维护功率控制信号。该方法缩短了用户单元111获取信道以开始通信的时间,并在闭环功率控制降低发射功率之前的初始传输过程中防止用户单元111的发射功率电平变得太高而干扰其它信道。
RCS104从诸如但并不仅限于E1、T1或HDSL接口的接口线路获取时钟同步。RCS104还可使用振荡器生成自己的内部时钟信号,该振荡器可以由全球定位系统(GPS)接收机调整。RCS104生成可由远程用户单元111获取的全局导频编码。RCS104的所有传输信道与全局导频信道同步。在RCS104中用于逻辑通信信道的编码生成器(图1中未示)的扩展码相位也与全局导频信道的扩展码相位同步。类似地,接收RCS104全局导频编码的所有用户单元111-118使它们的编码生成器的扩展和解扩编码相位与全局导频编码同步。
典型地,现有技术的信道被看作通信路径,该通信路径是接口的一部分并可与接口的其它路径相区别,而不考虑其内容。然而,对于CDMA通信,各通信路径由它们的内容来区别。本发明的所有逻辑信道和子信道被映射成公共的64千码元每秒(ksym/s)的QPSK数据流。使一些信道与相关导频码同步,该导频码由全局导频码生成并执行与其类似的功能。系统导频信号不被看作逻辑信道。
在RCS104和用户单元111之间的RF通信链路上使用若干逻辑通信信道。每条逻辑通信信道或者具有一个固定的预定扩展码或者具有一个动态分配的扩展码。对于预定和分配的扩展码,编码相位都与全局导频编码同步。
扩展码由用于生成编码的种子(seed)指定。在RDU中有许多“主种子”,一部分组成全局主种子,其余的组成分配主种子。RDU102根据需要将这些主种子分配给RCS104。全局主种子生成所有由RCS104在一个小区内使用的全局信道编码。而分配主种子用于生成二级分配种子。一个主分配种子生成五十七(57)个二级分配种子。每个二级分配种子被输入RCS104和用户单元111中的编码生成器以生成一组分配信道编码从而支持每条通信链路。在优选实施例中,分配每个RCS104一个用于生成全局信道编码的全局主种子和两个主分配种子。因此,RCS104和它的相应用户单元111-118可最多生成114个 二级分配种子。由RCS104分配每个二级分配种子以生成用于工作链路的编码,从而允许足够的编码用于多达114个同时的通信链路。
逻辑通信信道被划分成两组:1)全局信道;和2)分配信道。全局信道组包括或者从RCS104向所有用户单元111-118传输或者从任一用户单元111-118向RCS104传输而不考虑用户单元111-118标识的信道。分配信道组中的信道是专用于RCS104和特定用户单元111之间通信的信道。
就全局信道组而言,全局信道组提供:1)广播控制逻辑信道,提供一点对多点业务用于向所有用户单元111-118广播消息和向用户单元111-118寻呼消息;和2)接入控制逻辑信道,在全局信道上提供点对点业务用于用户单元111-118接入系统并获取分配信道。本发明的RCS104具有一条广播控制逻辑信道和多条接入控制逻辑信道。本发明的用户单元111-118具有至少一条广播控制逻辑信道和至少一条接入控制逻辑信道。
由RCS104控制的全局逻辑信道是广播关于当前哪条业务信道和哪条接入信道可用的快速改变信息的快速广播信道(FBCCH),和广播慢速改变系统信息和寻呼消息的慢速广播信道(SBCCH)。
用户单元111使用接入信道(AXCH)开始与RCS104通信并接入分配信道。每条AXCH配有从RCS104到用户单元111的控制信道(CTCH)。RCS104使用CTCH确认并应答用户单元111的接入请求。与AXCH一起同步传输短接入导频(SAXPT)和长接入导频(LAXPT)以初始化接入并向RCS104提供时间和相位基准。当用户单元111提高发射功率以初始化接入RCS104时由其发射SAXPT。因为SAXPT是相对较短的编码,它允许RCS104快速检测用户单元111并避免用户单元111的功率过高。在1998年12月25日公开的标题为“使用短码在CDMA系统中控制初始化功率升高的方法”的美国专利US 5,841,768中更加详细地描述了关于使用SAXPT升高发射功率的更多细节。在RCS104检测到SAXPT之前,用户单元111并不发射任何其它信号。一旦检测到SAXPT,用户单元111开始发射向RCS104提供时间和相位基准并允许RCS104确定信道脉冲响应的LAXPT。
就分配信道组而言,该组包括控制RCS104和用户单元111之间单条通信链路的逻辑信道。当形成分配信道组时,建立一对用于每条上行和下行连接的功率控制逻辑消息信道并根据连接类型建立一对或多对业务信道。载体控制功能执行所需的前向差错控制、载体速率修改和加密功能。
当建立通信链路时每个用户单元111-118具有至少一个分配信道组,并且每个RCS104-110具有多个分配信道组,每组逐渐用于每条通信链路。一旦成功建立通信链路即为该通信链路建立逻辑信道的分配信道组。该分配信道组包括发送中的加密、FEC编码和多路复用和接收中的解密、FEC解码和多路分解。
每个分配信道组提供一组面向点对点业务的通信链路并在指定RCS104和指定用户单元111之间双向工作。为通信链路形成的分配信道组可控制与单条通信链路相关的RF通信信道上的多个载体。多个载体用于传送分布式数据例如但并不限于ISDN。分配信道组可为载体速率修改功能提供双重业务信道以加速转换到用于高速传真和调制解调器业务的64kb/s PCM。
根据成功通信链路形成并包括在分配信道组中的分配逻辑信道专用于信令信道传号线(OW),APC信道和一个或多个业务信道(TRCH),该业务信道是根据所支持业务的8、16、32或64kb/s的载体。对于话音业务,在业务信道上可支持中等速率编码语音ADPCM和PCM。对于ISDN型业务,两条64kb/sTRCH形成B信道且一条16kb/sTRCH形成D信道。可选地,APC子信道可独立在自己的CDMA信道上调 制,或者与业务信道或OW信道时分复用。
本发明的每个用户单元111-118最多可支持三条同时业务信道。用户单元最好用作POTS用户单元112或ISDN用户单元115。虽然根据本发明POTS用户单元112并不支持ISDN业务,但可为任一种业务类型动态分配带宽资源。例如,POTS用户单元112可建立一条附加POTS线路并将其拆除,或者ISDN用户单元115可动态增加B信道传送载体或将它们拆除。对于POTS业务的动态带宽分配,当前32kb/s ADPCM业务将载体类型从32kb/s修改成64kb/s未编码数据以支持传真传输。由RCS104通过监测2100Hz应答音的出现确定传真呼叫的出现。
对于ISDN业务的动态带宽分配,RCS104监测ISDN D信道消息以确定何时请求B信道和何时将其拆除。一旦RCS104确定需要改变承载信道分配,RCS104初始化动态载体分配过程,下文将更详细地说明该过程。TRCH的三种逻辑信道到用户数据的映射如表一所示:
业务 | TRCH(0) | TRCH(1) | TRCH(2) |
16kb/s POTS | TRCH/16 | 未用 | 未用 |
32+64kb/s POTS(在BCM期间) | TRCH/32 | TRCH/64 | 未用 |
32kb/s POTS | TRCH/32 | 未用 | 未用 |
64kb/s POTS | 未用 | TRCH/64 | 未用 |
ISDND | 未用 | 未用 | TRCH/16 |
数字LL64kb/s | TRCH/64 | 未用 | 未用 |
数字LL2×64kb/s | TRCH/64 | TRCH/64 | 未用 |
模拟LL64kb/s | TRCH/64 | 未用 | 未用 |
表一:业务类型到三种可用TRCH信道的映射
根据本发明制造的用户单元200一般如图3所示。用户单元200 包括接收机部分202和发射机部分204。天线206从RCS104接收信号,该信号由带通滤波器208滤波,带通滤波器208具有两倍于码片速率的带宽和等于扩频系统带宽中心频率的中心频率。由混频器210使用恒定频率(Fc)本地振荡器将滤波器208的输出下变频成基带信号。然后通过在PN接收机生成器214中向混频器212为每条逻辑信道施加一个PN序列扩频解码混频器210的输出。混频器212的输出被输入编译码器218,该编译码器218与通信实体220对接。
来自通信实体220例如图2A-2E所示装置的基带信号由编译码器218脉冲编码调制。优选使用32kb/s自适应脉冲编码调制(ADPCM)。PCM信号被施加给PN发射机生成器224中的混频器222。混频器222为每条逻辑信道使PCM数据信号与PN序列相乘。混频器222的输出施加给低通滤波器226,其截止频率等于系统码片速率。然后滤波器226的输出施加给混频器228并被合适地上变频,如施加给其它终端的载频Fc所确定。然后上变频后的信号通过带通滤波器230到驱动天线234的宽带RF放大器232。尽管图示两个天线206、234,优选实施例包括用于发射和接收的双工器和单个天线。数字信号处理器(DSP)236控制采集处理以及接收机和发射机PN生成器214、224。
根据本发明制造的包括多个RCS104、105、110的基站101如图4所示。为简单起见,只图示一个RCS104。基站101包括接收机部分302和发射机部分304。天线306从用户单元接收信号,该信号由带通滤波器308滤波,带通滤波器308具有两倍于码片速率的带宽和等于扩频系统带宽中心频率的中心频率。混频器310使用恒定频率(Fc)本地振荡器将滤波器308的输出下变频成基带信号。然后通过在PN接收机生成器314中向混频器312施加一个PN序列在每个调制解调器扩频解码混频器310的输出。然后混频器316的输出被发送给RDU318。
从RDU318接收基带信号。优选使用32kb/s ADPCM信号。 ADPCM或PCM信号在PN发射机生成器324中施加给混频器322。混频器322使ADPCM或PCM数据信号与PN序列相乘。混频器322的输出施加给低通滤波器326,其截止频率等于系统码片速率。然后滤波器326的输出施加给混频器328并被合适地上变频,如施加给其它终端的载频Fc所确定的。然后上变频后的信号通过带通滤波器330到驱动天线334的宽带RF放大器332。尽管图示两个天线306、334,优选实施例包括用于发射和接收的双工器和一个天线。数字信号处理器(DSP)336控制采集处理以及接收机和发射机生成器314、324。
该系统在RCS104和多个用户单元111-118之间提供无线链路。为了尽可能地节约带宽,该系统选择性地分配支持特定通信所需传输速率所需要的带宽。这样,系统确保有效地使用带宽。例如,重新参见表一,通过32kb/s的自适应脉冲编码调制(ADPCM)信道可有效地传送话音通信。然而,高速传真或数据调制解调器信号需要至少64k/bsPCM信号以可靠地传输通信。另外,虽然用户单元已经为ISDN业务付费,该业务包括两条64kb/s的B信道和一条16kb/s的信道,但很少一直使用全部ISDN容量。多种不同的数据传输速率也可由始发和终接节点使用。
该始发和终接节点可包括计算机、传真机、自动呼叫和应答装置、数据网络或这些设备的任一组合。为了数据的强壮通信,在任何数据传输之前必须确保通信系统转换到通信节点所需的数据传输速率。该系统必须能够有效地分配带宽并根据用户请求在这些数据通信速率之间动态地转换。从低速率(支持话音通信)到高速率(支持编码数据通信)传输速率的修改确保在通信信道上可靠快速地传输数据。另外,如果即将分配ISDN D信道并且需要一个或两个B信道,该系统必须确保启动编码生成器以支持该通信。
对于POTS,存在两种或者修改承载信道(TRCH信道)或者增加或拆除一条新承载信道的基本情况。第一,将承载信道从32kb/s的 编码ADPCM型修改为64kb/s非编码的PCM业务以支持传真传输。第二,当在进行OA&M呼叫(内务、管理和维护)用户摘机时,或当在进行POTS呼叫开始OA&M呼叫时,增加或拆除一条新承载信道。当在进行OA&M无声呼叫时,用户单元112可以通过监测用户单元112和通信装置170(挂机/摘机传感器)之间A/B接口上的变化确定用户在开始一个新POTS呼叫。关于为POTS动态分配带宽的更多细节可在于1998年8月25日公开的标题为“码分多址(CDMA)通信系统”的美国专利US5,799,010中发现。
对于ISDN业务,动态带宽分配是指根据需要在D、D和B或D和2B承载信道配置中选择性地分配D和B信道并在它们空闲时予以拆除。ISDN D信道传送控制消息并且当ISDN呼叫还在进行时不能被拆除。因此,用于ISDN业务的动态带宽分配仅涉及B信道的增加和拆除。
参见图5将更详细地说明根据本发明用于为ISDN业务动态分配带宽的过程400。当开始一个ISDN呼叫时,首先建立D信道(步骤402)。通过信道D上的消息从主叫ISDN装置到被叫ISDN装置传递特定应用所需的带宽(步骤404)。这些消息以HDLC格式并且RCS104通过HDSL接口监测这些消息(步骤406)。一旦RCS104确定需要多少条B信道(步骤408),它开始在空中接口上建立这些承载信道(步骤410)。在ISDN呼叫过程中RCS继续在D信道上监测HDLC消息并确定是否将接入或断开附加B信道。如果附加B信道应当被接入或断开,RCS104开始在空中接口上建立或拆除承载信道(步骤414)。
将参见图6A和6B描述表示承载信道建立简化过程600的流程图。在发送SAXPT(步骤604)时用户单元111快速提高其发射功率(步骤602)。当RCS104检测到SAXPT(步骤606)时,它在FBCCH上将业务指示比特置为“红”(步骤608)以通知用户单元111它已经被检测。RCS104发送FBCCH(步骤610)。用户单元111监测FBCCH(步骤612) 并且当它发现FBCCH上的“业务指示”变红时停止快速升高(步骤614)。然后在发送LAXPT时(步骤618)用户单元111开始慢速提高其发射功率(步骤616)。当RCS获得LAXPT时(步骤620),它在CTCH上通过SYNC-OK消息通知用户单元111(步骤622)。这完成了接入过程的发射功率提高部分。
在用户单元111在CTCH上接收到SYNC-OK消息后(步骤624),它在AXCH上发送接入请求消息(步骤626)。一旦接收到该请求(步骤628),RCS104用CTCH上包括分配编码种子的消息确认AXCH消息的接收(步骤630)。用户单元111在AXCH上检测并确认传送分配编码种子的载体确认消息(步骤632和634),RCS104检测该确认(步骤636)。现在已协商编码转换,用户单元111和RCS104同时转换以使用该分配编码(步骤638和640)。现在建立了承载信道。
图7表示用户单元111和RCS104之间通信的分层协议并与开放系统互连(OSI)参考模型相对应。物理(PHL)层执行下述功能:1)生成CDMA编码;2)使发射机和接收机同步;3)为媒体访问控制(MAC)层提供载体;4)在由MAC指定的CDMA编码上并以MAC指定的功率电平扩展和传输比特;5)测量接收信号强度以允许自动功率控制;和6)生成并传输导频信号。MAC层执行下述功能:1)为前向纠错(FEC)编码和解码;2)分配CDMA编码;3)加密和解密;4)提供被合适加密和纠错的载体;5)成帧、检错和区别MAC对等消息和数据;6)链路控制(DLC)帧;和7)处理自动功率控制信息。数据链路控制层(DLC)在协议堆栈的高层之间提供无差错链路。
如图8A所示,用户单元111和RCS104之间的信令涉及该协议的MAC和DLC层。一旦如上所述为POTS业务建立承载信道,该业务可用并保持不变直到它被拆除或者直到在同时进行OA&M呼叫或POTS呼叫的情况下被修改以支持传真传输或第二呼叫。当正在进行一个OA&M呼叫并且用户单元111开始一个POTS业务呼叫,进入 图8A所示的过程。该图表示由用户单元111发起的简化载体转换方法。消息在用户单元111的数据链路控制层(DLC)、媒体访问控制层(MAC)和RCS104中的相应层之间传送。首先,用户单元111的DLC层向用户单元111的MAC层发出一个转换请求,该MAC层将该转换请求提交给RCS104的MAC层。RCS104在MAC层上向用户单元111发送一个确认并向RCS104的DLC层发送一个转换指示。在用户单元111中,在MAC层上从RCS104发出的转换确认被发送给用户单元111的DLC层。
当正在进行一个POTS业务呼叫并且RCS104向同一用户单元111发出一个OA&M呼叫时,进入图8B所示的过程。该图表示由RCS104发起的简化载体转换方法。RCS104在MAC层上向用户单元111始发一个转换指示消息。然后用户单元111通过DLC层中继该消息。
将参见图9A和9B说明为ISDN建立承载信道。步骤902-940与图6A和6B中的相应步骤602-640相同。然而,在用户单元111和RCS104都转换到分配编码(步骤938和940)之后需要若干附加步骤。一旦用户单元111和RCS104转换到分配编码(步骤938和940)ISDN D信道变得可用。在这里用户单元111和ISDN装置之间的S/T接口已经是可用的。RCS104开始监测HDLC格式的D信道消息(步骤942)。一旦检测到特定应用需要一个或多个B信道(步骤944),RCS104开始在空中接口上建立这些承载信道。然后根据图5所示的过程继续处理。用于该过程的MAC和DLC消息流与图8B中相同。
通过相同的消息流接入或断开用于POTS和ISDN的承载信道。由D信道消息相应字段中的值指示承载信道是接入还是断开。因此图8B中的流程图应用于动态接入承载信道以及动态断开承载信道。
虽然已经通过详细参考某些特定实施例描述本发明,这些细节将是指导性而非限制性的。对于本领域的技术人员很明显,在不脱离在 此教导中所公开的本发明精神和范围的情况下,可在工作模式和结构中进行各种改变。
Claims (28)
1.一种用于选择性地分配带宽的设备,该设备包括:
被配置为接收来自一不同的设备的一专用信道的装置,该专用信道承载一服务的数据;
被配置为接收在该专用信道上的一信息的装置;
被配置为响应所接收的信息,通过改变额外的专用信道的数目,动态地建立或拆除用于接收的额外的专用信道的装置,其中所述额外的专用信道承载所述服务的数据。
2.如权利要求1所述的设备,该设备包括:
用来传送用以设定该专用信道的传送功率等级的传送功率命令的装置。
3.如权利要求l所述的设备,其中该信息表示一需要的带宽。
4.如权利要求1所述的设备,其中当所述额外的专用信道其中之一闲置时,该额外信道即拆除。
5.如权利要求1所述的设备,其中所述额外的专用信道是经过分配的,且其当闲置时,所述额外信道并不会使用,而在整个服务期间,该专用信道则是激活的。
6.如权利要求1所述的设备,其中一带宽根据一所需要的带宽拨出给该设备,该专用信道及任何额外的信道不具有超过该拨出带宽的一总带宽。
7.如权利要求6所述的设备,其中所述额外信道根据该拨出的带宽动态的增加。
8.如权利要求1所述的设备,其中专用及任何额外的专用信道的一扩频码动态的分派。
9.如权利要求1所述的设备,该设备进一步包括用于传送表示一想要带宽的要求的装置。
10.一种用于选择性地分配带宽的设备,该设备包含:
用于传送一控制信道至一不同的设备的装置,该控制信道承载指示专用信道是否应该建立的信息,
用于允许所述不同的设备通过改变额外的专用信道的数目而动态地建立或拆除用于接收的额外的专用信道的装置。
11.如权利要求10所述的设备,其中该信息表示一服务所需要的带宽。
12.如权利要求10所述的设备,该设备还包含用于传送一导引信号到所述不同的设备的装置。
13.如权利要求10所述的设备,该设备还包含用于接收用于设定在该专用信道的传送功率等级的功率命令的装置。
14.如权利要求10所述的设备,其中该专用信道的一扩频码是动态的分配。
15.一种在用于选择性地分配带宽的设备内使用的方法,该方法包括:
接收来自一不同的设备的一专用信道,该专用信道承载一服务的数据;
接收在该专用信道上的一信息;
响应所接收的信息,通过改变额外的专用信道的数目,动态地建立或拆除用于接收的额外的专用信道,其中所述额外的专用信道承载所述服务的数据。
16.如权利要求15所述的方法,该方法包括:
传送用以设定该专用信道的传送功率等级的传送功率命令。
17.如权利要求l5所述的方法,其中该信息表示一需要的带宽。
18.如权利要求15所述的方法,其中当所述额外的专用信道其中之一闲置时,该额外信道即拆除。
19.如权利要求15所述的方法,其中所述额外的专用信道是经过分配的,且其当闲置时,所述额外信道并不会使用,而在整个服务期间,该专用信道则是激活的。
20.如权利要求15所述的方法,其中一带宽根据一所需要的带宽拨出给该设备,该专用信道及任何额外的信道不具有超过该拨出带宽的一总带宽。
21.如权利要求20所述的方法,其中所述额外信道根据该拨出的带宽动态的增加。
22.如权利要求15所述的方法,其中专用及任何额外的专用信道的一扩频码动态的分派。
23.如权利要求15所述的方法,进一步包括:传送表示一想要带宽的要求。
24.一种在用于选择性地分配带宽的设备内使用的方法,该方法包含:
传送一控制信道至一不同的设备,该控制信道承载指示专用信道是否应该建立的信息,
允许所述不同的设备通过改变额外的专用信道的数目而动态地建立或拆除用于接收的额外的专用信道。
25.如权利要求24所述的方法,其中该信息表示一服务所需要的带宽。
26.如权利要求24所述的方法,该方法还包含传送一导引信号到所述不同的设备。
27.如权利要求24所述的方法,该方法还包含接收用于设定在该专用信道的传送功率等级的功率命令。
28.如权利要求24所述的方法,其中该专用信道的一扩频码是动态的分配。
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