即时通信系统用户的增加，使得对服务器端的维护逐步成为现有即时通信系统的瓶颈。
The amount of the user of the Instant Messaging System is increasing all the time, which makes the maintenance of the server become the bottleneck of the im System.
针对低轨卫星移动通信系统用户在多星覆盖的情况下的位置注册问题，提出了仰角和覆盖时间加权策略。
In LEO satellite network, MTs are always covered by more than one satellite simultaneously. A satellite selection strategy for the MT to register its location is presented in this paper.
他们最近的财务业绩是全球移动通信系统手机用户持续增长的直接结果。
Their latest financial performance was a direct result of consistent growth in GSM cell phone subscribers.
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