描述
RNC在以下2种情况下将涉及到用户平面的操作:一种是对小区的公共传输信道做操作的时候;另一种是为UE提供专用信道的时候。在对传输信道做操作的过程中,用户平面只有FP同步消息,不会有RRC消息。当RNC涉及到对UE操作时候,需要先在RNC和UE之间建立一个无线连接(RRC连接),建立过程大致如下:UE先向RNC请求建立RRC连接,RNC收到请求后根据具体情况选择是否为该UE建立专用信道。如果要建立专用信道(dedicatedchannel,DCH),RNC将通过NBAP协议请求建立无线链路或者重配置无线链路,NodeB成功应答后,RNC将通过ALCAP协议分配DCH所需的AAL2链路,成功分配后RNC通过前向接入信道(forwardaccesschannel,FACH)发送RRC建立成功消息。如果不需要为该UE建立专用信道,那么就没有上述NBAP和ALCAP过程,RNC将直接通过FACH发送RRC建立成功消息,该消息将指示UE只能通过公共传输信道传输所有的消息给RNC。图2显示了Iub接口中可能会出现的消息种类。
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①Allen-Bradley(美国AB)系列产品》
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⑥销售ABB Robots.FANUC Robots、YASKAWA Robots、KUKA Robots、Mitsubishi Robots、OTC Robots、PanasonicRobots、MOTOMAN Robots。
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据通信及处理等。Invensys Triconex:冗余容错控制系统、基于三重模件冗余(TMR)
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⑨Siemens(西门子):Siemens MOORE,Siemens Simatic C1,Siemens数控系统等。
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