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Table 5 List of VQLS and associated switching types

From: The impact of video-quality-level switching on user quality of experience in dynamic adaptive streaming over HTTP

Video quality level (VQL) Video characteristics VQL switching event VQL switching type
VA (SR1, TR1) VA ← → VB TRS (VAB)
VB (SR1, TR2) VB ← → VC TRS and SRS (VBC)
VC (SR2, TR1) VB ← → VD SRS (VBD)
VD (SR2, TR2) VC ← → VD TRS (VCD)
VE (SR3, TR2) VA ← → VE TRS and SRS (VAE)
VF (SR3, TR1) VE ← → VF TRS (VAE)