With the emergence of the High Efficiency Video Coding (HEVC) standard, significant additional video compression improvements have recently been provide, notably around 50% increased compression performance regard ing the previously available standard video coding solution s. Moreover, the same requirements which demanded some years ago for a scalable extension of the H.264/AVC standard, named Scalable Video Coding (SVC) are now again demanding the deve lopment of a scalable extension of the HEVC standard, meani ng that an HEVC compliant base layer should be adopted. In thi s context, this paper serves three main purposes: first, it re ports the recent efforts towards developing a scalable video coding framework based on the HEVC standard; next, it reviews the cu rrent compression performance for quality scalability sol utions against the most relevant available alternatives, notably t he SVC standard quality scalable solutions and the H.264/A VC and HEVC simulcasting and single-layer solutions; final ly, it discusses the possible architectural designs for th e scalable HEVC extension to bring a clearer view about the ad vantages and disadvantages of each technical approach. Keywords—Scalable coding; HEVC; H.264/AVC; H.264/SVC; Simulcasting; Single layer coding,
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