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The capacity region of 1-to-K broadcast packet erasure channels with ACK/NACK is well known for some scenarios, e.g., K ≤ 3, etc. However, existing achievability schemes either require knowing the target rate R ^→ in advance, and/or have a complicated description of the achievable rate region that is difficult to prove whether it matches the capacity or not. This work proposes a new network coding scheme with the following features: (i) its achievable rate region is identical to the capacity region for all the scenarios in which the capacity is known; (ii) its achievable rate region is much more tractable and has been used to derive new capacity rate vectors; (iii) it employs sequential encoding that naturally handles dynamic packet arrivals; (iv) it automatically adapts to unknown packet arrival rates R ^→ ; (v) it is based on GF(q) with q ≥ K. In addition to analytically characterizing the achievable rate region of the …