2.5G
CDMA Glossary
CDMA — 2.5G
Information on 2.5G
One of the major limitations of second generation cellular communications systems is that data can only be transferred after a connection has been established. This is inefficient if only small amount of data is transferred, and in situations where data is transferred in bursts. 2.5G cellular systems allow a mobile station to be "always-online" for sending and receiving packet data. This allows efficient transfer of small amounts of data, without the overhead of establishing a connection for each transfer. It also efficiently supports bursty data transfers, avoiding the need to allocate capacity to a connection that cannot be reallocated by the network if the connection chooses not to use it. The two major forms of 2.5G enhancements to second-generation cellular systems are the General Packet Radio Service (GPRS) and Enhanced Data Rates for Global Evolution (EDGE).
Other topics in our resources on CDMA related to 2.5G include:
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