Client-Driven Joint Cache Management and Rate Adaptation for Dynamic Adaptive Streaming over HTTP

Table 1

Definition of the main symbols.

𝐵	Predicted buffered media time
𝐵𝑡rec(rid𝑐,snum)	𝐵 at time instants 𝑡recrid𝑐,snum
𝐵𝑉	Variation of predicted buffered media time
𝑏𝑟	Media bitrate
CS	Caching status
MSD	Predefined media segment duration
(rid,snum)	Representation ID and segment number to identify a segment
𝑡cache	Time to cache a segment
𝑡rec	Time to receive a segment
𝑡req	Time to request a segment
𝜃^↑𝐵,  𝜃^↓𝐵	Upper threshold, lower threshold of predicted buffered media time
𝜃^↑𝐵𝑉,  𝜃^↓𝐵𝑉	Upper threshold, lower threshold of variation of predicted buffered media time
snum, snum𝑐	Segment number, current segment number to be requested by client
SFT	Segment fetch time
SFT	Estimated SFT for a subsequent segment
SFT^𝑐	SFT measured by client
SFT^𝑝	SFT measured by proxy cache
SFT𝑝2𝑐	SFT measurement from proxy cache to client
SFT𝑠2𝑝	SFT measurement from the origin server to proxy cache
SFT^′𝑝2𝑐	The recent sample of SFT𝑝2𝑐
SFT^′𝑠2𝑝	The recent sample of SFT𝑠2𝑝
𝑝2𝑐	Proxy cache to the client
𝑠2𝑝	Origin sever to the proxy cache
rid,rid𝑐, rid𝑝	Representation ID,; The current representation ID,; the previous representation ID
𝑤, 𝑤𝑓,; and 𝑤𝑝,	Window size of the subsequent, prefetching and previous segments
𝛾	Window size of the representation ID