How do you differentiate between different types of handoff? Explain.
What will be an ideal response?
Handoff can be classified into two different types: hard handoff and soft
handoff. Hard handoff is also known as break before make and is
characterized by releasing current radio resources from the prior BS before
acquiring resources from the next BS. Both FDMA and TDMA employ hard
handoff. The feature of soft handoff is that two base stations are connected to
the same mobile station during the handoff. Soft handoff can be used only in
CDMA. In CDMA, the same channel is used in all the cells, if the code is not
orthogonal to other codes being used in the next BS, the code could be
changed. It is possible for an MS to communicate simultaneously with the
prior BS as well as the new BS for some short duration of time, during the
process of handoff.
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