QoE-Oriented Cooperative Broadcast Optimization for Vehicular Video Streaming

Algorithm 2

QoE-oriented buffer action determination mechanism.

1: Input: current buffer state , received data throughput

2: Output: buffer action, updated buffer state ,

QoE of video segment in region

3: for each time slot do

4: ifthen

5:  choose buffer action , no buffer for vehicle requester ;

6:  Adding constraints to algorithm 1;

7:  ;

8: end if

9: obtain the data throughput through algorithm 1;

10: ifthen

11:  choose buffer action and calculate the new buffered segments and quality level;

12:  update and video quality level , , in next intervals respectively;

13: end if

14: if then

15:  choose buffer action and upgrade the quality level in region then buffer new segments;

16:  update and video quality level , , in next intervals respectively;

17: end if

18: ifthen

19:  no buffer state changed;

20: end if

21: calculate the QoE of video segment in region ;

22: update buffer states for next time slot ;

23: end for

24: return buffer action and QoE for each time slot;