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The RNCs enables autonomous radio resource management (RRM) by UTRAN. The
RNC and its associated Node-Bs form Radio Network Subsystem (RNS). The UTRAN
consists of several such RNSs. RNCs also assist in Soft Handover of the UEs
when a UE moves from one cell to another. In soft Handover, the UE is in
communication with more than one Node-Bs and RAKE receiver technique can be
used to achieve micro diversity, thus eliminating the fading. This is one of
several features arising out of CDMA modulation technique. Other advantages of
using CDMA technique are higher bandwidth, scalability in the number of users
served, power control and easier logical link control (since Time slots are
eliminated). The figure 3.2 below shows the RNC functions along
with a soft Handoff scenario.
Figure 3.2:
RNC Function (Source:www.iec.org)
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2002-10-12