Performance Evaluation of Concurrent Multipath Video Streaming in Multihomed Mobile Networks

Algorithm 1

Stream preprocessing algorithm (H.264/SVC version).

10 #STREAM PRE-PROCESSOR (H.264/SVC)

15 Get number of available paths 𝑚 from Home Agent

20 For each available network path 𝑛

30  Get current bandwidth 𝑏^𝑐_𝑛 from path monitoring sub-system

40  Get max bandwidth 𝑏^ℎ_𝑛 min bandwidth 𝑏^𝑙_𝑛 from route history file

50    If 𝑏^𝑐_𝑛 < 𝑏^𝑙_𝑛 lowest known bandwidth 𝑏_𝑛^𝑙𝑘=𝑏^𝑐_𝑛, else 𝑏_𝑛^𝑙𝑘=𝑏^𝑙_𝑛

60    If 𝑏^𝑐_𝑛 > 𝑏^ℎ_𝑛 highest known bandwidth 𝑏_𝑛^ℎ𝑘=𝑏^𝑐_𝑛, else 𝑏_𝑛^ℎ𝑘=𝑏^ℎ_𝑛

65 Next path

70 Base-layer target rate 𝑅^bl = ∑^𝑛=𝑚_𝑛=1(𝑏_𝑛^𝑙𝑘)

80 Extraction target rate 𝑅^ex = ∑^𝑛=𝑚_𝑛=1(𝑏_𝑛^ℎ𝑘)

90 If real time streaming encode scalable bit stream using 𝑅^bl

100 Perform rate distortion calculations to each NAL unit

110 Assign quality level for each NAL unit to simple_priority_id in NAL header as defined in [32]

120 Extract scalable bit stream at target 𝑅^ex