5-WCDMA系统基本原理.ppt

* Channel types in UTRAN ? Physical channel: form the physical existence of the Uu interface betweenthe UE domain and access domain. ? RNC deals with transport channels:carry different information flows over the Uu interface and the physical elements. ? Logical channels: different tasks the network and the terminal should perform in different moments of time. * * * * DPCCH产生于物理层，内容不会释放到高层当中去。摘机的信令在DPDCH中使用 * DPCCH产生于物理层，内容不会释放到高层当中去。 * * Cs^i,k来表示，其中i=0,1,...,63为扰码码组的序号，k=0,1,2,...,14为时隙号。每个SSC是从长为256的16个不同码中挑选出来的一个码 SCH不扩频，不加扰！ 每个时隙发送一个从同步码，一个帧中每个时隙发送什么样的SSC是定死的，即协议给出了64种确定的组合。 所有小区，所有时隙PSC（主同步码）都是一样的。 手机通过相干检测，来确定时隙，PSC=1，-1，-1，1，1，如果手几检测的PSC和其自身的PSC是相关性最大的，那么系统会产生一个电平峰直，确认到时隙的同步。 * 可以这么理解。180KM相当于2304chip（因为1 chip的时间相当于78.123米），而定时关系是按下行基站发射为起点的，因此，基站上行搜索的时候需要按2倍的小区半径搜索。也就是2304×2＝4608。 * * * * * The primary scrambling code sequence, when transmitted on the air interface, is cut down to 38400 chips, which obviously corresponds to the duration of a single radio frame of 10 ms. In fact, the primary CPICH channel, which is exactly synchronised to the downlink radio frame borders, does contain the plain scrambling code. The data on the CPICH, before spreading with (256,0) consists of the sequence 1111. After spreading with (256,0), which is a sequence of 256 1 the CPICH data contains simply 38400 1 per frame before scrambling. The scrambling operation then does multiply the data chip by chip with the 38400 chips of the scrambling code word.Obviously, then the plain primary scrambling code is sent radio frame by radio frame of the P-CPICH. Since the receiver, after detection of the scrambling code group does know out of which set of 8 possible primary scrambling codes the scrambled data on the P-CPICH comes from, it can detect the used SC on the P-CPICH. * * 强调层面分离的概念 层：协议结构包括三层：无线网络层、传输网络层和物理层。 所有UTRAN相关问题只与无线网络层有关，传输网络层只是UTRAN采用的标准化的传输技术，与UTRAN的特定功能无关。 物理层可以采用E1、T1、STM-1等数十种标准接口。 面： 控制平面包括无线网络层的应用协议和传输网络层的信令承载，RANAP(Iu)、NBAP(Uu)、RASAP(Iur)。 用户平面包括无线网络层的数据流和传输网络层的数据