Nhiều giao thức truy cập đối với truyền thông di động P3
Nhiều giao thức truy cập đối với truyền thông di động P3
MULTIPLE ACCESS IN CELLULAR COMMUNICATION SYSTEMS To examine the problem of multiple access in cellular communications, first the relevant OSI layers need to be identified, which is not necessarily straightforward. A split into basic multiple access schemes such as CDMA, TDMA, and FDMA, associated with the physical layer, and multiple access protocols, situated at the medium access control layer, is adopted here. After a discussion of basic multiple access schemes, approaches chosen for medium acc