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随着数字压缩传输多套视频节目的出现,目前MMDS系统可以充分地与同轴电缆系统以及其它例如广播直播卫星等娱乐经营系统相竞争,然而,要想获得最大的额外增值业务收入,开展例如PPV(按次付费)、IPPV(脉冲式按次付费)、NVOD、VOD以及诸如国际互联网等双向业务,MMDS系统必须要能够提供实时(或者准实时)的双向操作。目前,PPV的节目单及其点播可以通过用户提前电话预约安排来实现,也可以通过电话回传来实现用户对PPV和IPPV节目单的获得和选择,这就需要
With the advent of multiple compressed video transmissions, the current MMDS system can compete adequately with coax systems and other entertainment operating systems such as broadcast direct broadcast satellites. However, to maximize revenue from additional value added services, for example, PPV (pay-per-view), IPPV (impulsive pay-per-view), NVOD, VOD and bi-directional services such as the Internet. The MMDS system must be able to provide both real- time and near real-time bidirectional operations. At present, PPV programs and their on-demand can be achieved through the user’s advance telephone booking arrangement, and the user can obtain and select PPV and IPPV programs by telephone back-end, which requires