论文部分内容阅读
MMDS是一种新的宽带数据接入业务,在移动用户和数据网络之间提供一种连接,给移动用户提供高速无线宽带接入服务。早期MMDS主要是一种单向非分配型图像业务传输系统。现在能以比E1更快的速率发送和接收数据信号。该技术可以提供点对点面向连接的数据业务、点对多点业务、点对点无连接型网络业务,其中点对点面向连接的数据业务是为两个用户或者多个用户之间发送多分组的业务,该业务要求有建立连接、数据传送以及连接释放等工作程序;点对多点业务可以根据某个业务请求者的要求,把单一信息传送给多个用户,该业务又可以分为点对多点多信道广播业务、点对多点群呼业务等;点对点无连接型网络业务中的各个数据分组彼此互相独立,用户之间的信息传输不需要端到端的呼叫建立程序,分组的传送没有逻辑连接,分组的交付没有确认保护。除了提供点对点、点对多点的数据业务外,MMDS还能支持用户终端业务、补充业务、GSM短消息业务和各种GPRS电信业务。
MMDS is a new broadband data access service that provides a connection between mobile users and data networks and provides mobile users with high-speed wireless broadband access services. Early MMDS is mainly a unidirectional non-distribution type image service transmission system. It is now possible to send and receive data signals faster than E1. The technology can provide point-to-point connection-oriented data services, point-to-multipoint services, point to point connectionless network services, point-to-point connection-oriented data services for the two users or multiple users to send multi-group business, the business Requires the establishment of connections, data transfer and connection release and other procedures; point to multipoint services according to the requirements of a business requester, a single message sent to multiple users, the business can be divided into multipoint multipoint Broadcast services, point-to-multipoint group call services; peer-to-peer connectionless network services in each data packet independent of each other, the information transmission between users does not require end-to-end call setup, packet transmission is not logical connection, packet The delivery did not confirm the protection. In addition to providing point-to-point, point-to-multipoint data services, MMDS also supports user terminal services, supplementary services, GSM short message services and various GPRS telecommunications services.