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IEEE/ICACT20260346 Question.8 Questioner: xueyy@dsp.ac.cn 2026-02-09 오후 12:04:24	IEEE/ICACT20260346 Answer.8 Answer by Auhor tanghr@dsp.ac.cn 2026-02-09 오후 12:04:24
In UW-LFRR’s two-stage relay selection strategy, what scenarios are the first stage and the second stage respectively suitable for?	Phase I (backbone-oriented fast search) is suitable for most failure scenarios where the backbone is still partially available, i.e., when there are usable backbone nodes within the branch-off region (Ku) that can serve as grafting points. This phase achieves a bounded path stretch (at most 2 extra hops) with low computational complexity. Phase II (branch-off fallback search) is triggered only when Phase I fails (i.e., when the backbone is completely disrupted within Ku, making Cmain = ∅), and it searches for a short detour over all of Ku to ensure connectivity when the backbone is fully cut.

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