Distributed Multimedia Streaming over Peer-to-Peer Network
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Distributed Multimedia Streaming over Peer-to-Peer Network

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Distributed Multimedia Streaming over Peer-to-Peer Network Distributed Multimedia Streaming over Peer-to-Peer Network Presentation Transcript

  • Distributed Multimedia Streaming over Peer-to-Peer Network Jin B. Kwon, Heon Y. Yeom Euro-Par 2003, 9th International Conference on Parallel and Distributed Computing, August 2003, (Klagenfurt, Austria) (Also published in LNCS 2790, Euro-Par 2003 Parallel Processing, pp. 851-858)
  • Agenda
    • Introduction
    • Definitions and assumptions
    • Transmission Scheduling
    • Fast Distribution
    • Simulations and Performance Studies
    • Conclusion
  • Introduction
    • Existing multimedia streaming
      • Client-sever model
      • -> server network bandwidth limitations…
    • Possible solutions
      • Multicast
      • ->scalability
      • Peer-to-Peer model
      • ->in early stage
  • Introduction
    • The authors focus on
      • 1)Transmission scheduling of the media data for a multi-supplier P2P streaming session
        • Supplying peers with heterogeneous out-bound bandwidth
        • The problem is to schedule the segments of media data so as to minimize the buffering delay
        • Propose Fixed-length slotted scheduling (FSS), better than OTS.
  • Introduction
    • The authors focus on
      • 2)Fast distribution of media contents
        • P2P system is self-growing.
        • Important to convert requesting peer to supplying peers as soon as possible
        • Propose FAST : aims at accelerating the speed at which the P2P system capacity increases
  • Definitions
    • Candidate Set : Set of supplying peers
    • Requesting peer
      • selects the supplying peers from the set,
      • opens a channel with each selected supplying peer,
      • requests the data segment from them according to a scheduling mechanism
      • After receiving, stores and becomes a candidate of the media content
  • Assumptions
    • Appropriate searching algorithm
    • γ : playback rate of the media data
    • P r : requesting peer
    • R in (r) : in-bound bandwidth P r
    • R out (r) : out-bound bandwidth P r
    • 0 < R in (r) ≤ γ R out > 0
    • : buffering delay
  • Transmission Schedule
    • The goal : minimize buffering delay while ensure continuous playback
    • Determine the data segments to be transmitted over each channel and the transmission order of the segments.
    • To ensure continuous playback
    Amount of consecutive data from the beginning of the media file received for t seconds d(t) Amount of data being played for t seconds since beginning of playback p(t)
  • OTS
    • Consider 4 channels with bandwidth of
  • Fixed Length Slotted Scheduling (FSS)
    • Variable-length segments are assigned to the channels in round-robin fashion
    • Define slot length w
    • i-th channel bandwidth B i
    • segment length wB i
    • Use previous example,
  • Fixed Length Slotted Scheduling (FSS)
    • notice the overhead transmission!
  • Fast Distribution - definition
    • Requesting Peer
    • Candidate Peer
    • Mature Peer : holding the whole media file
    • Immature Peer : being download the media data
  • Fast Distribution
    • X i (t, r) : when P i is assumed to be selected as a supplying peer of a request peer P r , the position within the media file of the data to be requested to transmit at t.
    Rate of increase For a immature peer to be a supplying peer of P r (called semi-mature peer)
  • Fast Distribution
    • X i (t, r) can not be determined until P r select its supplying peers
    • use upper bound function x r (t)
    However, not satisfying it does not mean that P i is not a semi-mature peer
  • Peer requesting video : procedure
    • Select from mature and semi-mature peers
    • Since FSS depends on B 1 , the maximum outbound bandwidth peer will be chosen. The procedure is repeated until B*(r) = R in (r)
  • Peer requesting video : procedure
    • If the P2P system is beyond capacity
      • Start download with the acquired channels and buffering (FAST1)
      • Withdraw the request and retry after a randomized second.(FAST2)
      • Start download with the acquired channels and retry to acquire the remainder after T minutes.(FAST3)
  • Simulation
    • Parameters
      • 50,100 peers, 100 seed peers initial
      • Request arrival rate follows Poisson distribution with mean 1/ Θ
      • Video length = 60min
      • Inbound bandwidth = γ
      • Outbound bandwidth :
        • Seed peers : γ /2
        • Others : γ /2, γ /4, γ /8 γ /16 : 10%, 10%, 40%, 40%
  • Performance Study
    • Assume
      • Channel bandwidth has one of γ /2, γ /4, γ /8 γ /16 … γ /2 n
      • B*(r) = γ
      • Time to transmit a segment
    =>
  • Conclusion
    • Variable length segment for Transmission Scheduling FSS
    • Define semi-mature peer for fast Distribution
    • Performance evaluation over OTS and FSS
  • ~ End ~