爱立信的高级技术资料，内容比较全面。 目录： 1. System Overview.............................................................................1 2. Channel Concept.......................................................................... 17 3. Traffic Cases................................................................................ 37 4. Signaling Introduction................................................................... 71 5. System Information....................................................................... 85 6. Um Interface........... .................................................................... 105 7. Abis Interface.............................................................................. 165 8. Message Transfer Part (MTP).................................................... 203 9. Signaling Connection Control Part (SCCP)................................. 217 10. MSC-BSC Interface.................................................................... 227 11. Transaction Capabilities Application Part (TCAP)....................... 237 12. Mobile Application Part (MAP).................................................... 243 13. Call Set-up and Location Updating............................................. 249 14. Supplementary Services............................................................. 283 15. Multiband.................................................................................... 301 16. Appendix A................................................................................. 309 17. Index........................................................................................... 325