PCS(Personal Communicatin Service)网络将使话音与数据通信综合在一起,成为新一代应用系统。然而,如果不能尽快推出一个标准的话,用户则仍将继续使用电话。目前正在建设和运行中的PCS网络都是数字的,它们可以支持用于数据通信的分组交换和用于电话的电路交换。这就使其能够实现话音与数据的综合应用,并产生出新的一类无线通信设备。但是,PCS承诺的服务要全部实现还有待时日。与模拟蜂窝网络不同,新的PCS系统并不是都采用相同的技术,目前至少有两种技术正在使用。这种竞争可能意味着用户不得不考虑购买何种电话才能保证它与所选的网络运营商使用的协议相匹配。缺少统一的标准也可能影响潜在的市场,致使要获得足以刺激价格竞争的巨大市场需要更长的时间。 TDMA(时分多址)和CDMA(码分多址)采用不同的方式实现由多用户共享频率进行话音和数据的收发。基于TDMA方式的系统分配给每个用户一个指定的时隙来发送和接收数据, PCS (Personal Communicatin Service) network will enable voice and data communications together to become a new generation of application systems. However, if a standard can not be released as soon as possible, the user will continue to use the phone. The PCS networks currently under construction and in operation are digital, and they can support packet switching for data communications and circuit switching for telephones. This makes it possible to achieve the integrated application of voice and data, and generate a new type of wireless communications equipment. However, PCS promised to fully realize the service to be completed. Unlike analog cellular networks, not all new PCS systems use the same technology, and at least two technologies are currently in use. This competition may mean that the user has to consider what kind of phone to buy to ensure that it matches the protocol used by the chosen network operator. Lack of uniform standards can also affect potential markets, which can take longer to obtain a large market that can stimulate price competition. TDMA (Time Division Multiple Access) and CDMA (Code Division Multiple Access) use different ways to achieve multi-user shared frequency for voice and data transceiver. The TDMA-based system assigns each user a designated slot for sending and receiving data,