Problem Statement of PPSP

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Presentation transcript:

Problem Statement of PPSP draft-ietf-ppsp-problem-statement-02 Yunfei Zhang July 25, IETF 81,Quebec City

Summary Reply all the comments in last IETF and in the mailing list during the adjournment Remove the ambiguous expressions Request for WGLC

Changes in Detail(1) Comments: The problems in mobile environment are NOT clear Updating Tracker protocol difference: connections are unsteady, lower and costly (esp. in uplink). Need more parameter to express Peer protocol difference Lower bandwidth determines the AMOUNT of exchanged data and FREQUENCY (e.g., bitmap) Mobility issue How to reflect mobility information like IP address change in two protocols

Changes in Detail(2) Updating the ecological relationship in different P2P streaming vendors Coexist in some scenarios P2P Cache Different clients in one terminal Different systems use PPSP for signaling and media transport, but implement something system specific on top of that The scheduling of data keeps intact for different systems

Changes in Detail(3) Clarify resource-constraint terminals problem PPTV（former PPLive) has issued iOS version in June,2011 Different apps run different daemons at the same time in PC. Same in smart phones Problem: Share 1G or exclusive access 500M if 1G is better for display? PPSP suggests to share 1G between daemons with better resource utilization Time 1: app1 run, app2 idle,1G for app1 Time 2: app1 stop, app 2 begin, 500 M for app1 and 500M for app2 Time 3: app 1 quit, app 2 run, 1G for app2 Else Any time :500M for app 1 and 500 M for app 2

Changes in Detail(4) Updating the CDN and normal peer interaction with more alternatives PPSP mode: CDN nodes as super peer HTTP mode: CDN nodes have complete content Hybrid mode: CDN servers the beginning phase with C/S mode and once there are enough peers, switch to PPSP mode

Changes in Detail(5) Updating the procedure for caches supporting P2P streaming Tracker Cache Inside peer Peer 1 ISP 1,Tracker protocol 4. cache 2. Tracker protocol, peer1 3,Peer protocol 5,Peer protocol/ HTTP

Actions Request for WGLC

Questions?