Discussion
Increasing base station density does NOT always prevent handoff failure because
Answer: A
The reason is that frequent handoffs overload the control channel.
Adding base stations makes cells smaller. A moving user then crosses cell boundaries more often, and every crossing needs a handoff, with measurement reports, channel allocation and signalling between the mobile, the base stations and the switching centre. If the handoff rate rises faster than the control channels and switch can handle, requests are delayed or dropped and calls fail, so denser cells do not always help.
More towers do not reduce signal power; nearby users actually receive stronger signals. Denser deployment makes cells smaller, not larger, and it raises total capacity through frequency reuse rather than lowering it.
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