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移动通信业务IP化对传输的要求在移动网中,核心网流量采用IP承载已经成为现实。移动基站传输接口也正从2G的E1、3G初期的ATM IMA E1转为以以太网接口为主(不同制式的IP化进程稍有差别),2G RAN的IP化地在进行中。与此相应,传输网络也必须适应移动网络IP化的趋势。在移动IP化趋势下,核心网的传输颗粒已经从TDM转变成分组业务,传输问题即为光层如何承载IP的问题。无线的传输问题要复杂很多,不仅因RAN范围更大,网络结构更加复杂,而且在IP化的大方向下,传统的TDM业务(如话音、TDM专线等)保持平稳增长趋势并
Mobile IP communications on the transmission requirements In the mobile network, the core network traffic using IP bearer has become a reality. The mobile base station transmission interface is also shifting from the 2G, E1 and 3G ATM ATM E1 to the Ethernet interface (the IP standard is slightly different for different standards). The IP of 2G RAN is in progress. Correspondingly, the transmission network must also adapt to the trend of mobile network IP. In the trend of mobile IP, the core of the transmission of particles has changed from TDM into a packet service, the transmission problem is how the optical layer carrying IP. The problem of wireless transmission is much more complex, not only because of the larger range of RANs but also more complex network structures. In the general direction of IP transformation, the traditional TDM services (such as voice and TDM leased lines) maintain a steady growth trend