摘要
1 GSM-WLL Technology1.1 GSM-WLL System ArchitectureAWLL (Wireless Local Loop)is a radioaccess system for users to access PSTN(Public Switched Telephone Network).It isa substitute for conventional wiredaccess.The GSM-WLL system makes use ofGSM technologies to achieve WLL.As shown in Figure 1,a GSM-WLL system
