Figure 2.4 shows the X2 protocol architecture. X2 Application Protocol (X2AP) layer
been discussed earlier. The role of X2 interface based handover will be discussed in
LTE RADIO
ACCESS TECHNOLOGY
11
3.
LTE RADIO ACCESS TECHNOLOGY
The legacy technologies like UMTS uses WCDMA as the multiple access technique
while GSM used the TDMA approach of multiple access with the frequency division
multiplexing. All of these technologies had their set of pros and cons. Most of access
methods in the legacy technologies imposed the limitation on capacity / coverage /
throughput of the system. With the requirements of 3GPP specified for LTE, the change
in the access technology was felt and thus the technology directed towards OFDMA.
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