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v1.0 - 20050426

Telecommunications Industry Association TR-30.3/08-12-017 Lake Buena Vista, FL December 8 - 9, 2008. v1.0 - 20050426. TIA921B Algorithm – An Update Alan Clark. Interfering Source Model. Packet. Parameters: p12, p21 = Transition probabilities (forward)

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v1.0 - 20050426

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  1. Telecommunications Industry Association TR-30.3/08-12-017 Lake Buena Vista, FL December 8 - 9, 2008 v1.0 - 20050426

  2. TIA921B Algorithm – An UpdateAlan Clark

  3. Interfering Source Model Packet • Parameters: • p12, p21 = Transition probabilities (forward) • p12, p21 = Transition probabilities (reverse) • k = MM update frequency 2 1 No packets Low value of k, low value of p21 … e.g. VoIP High value of k, high value of p21 … e.g. TCP

  4. Interfering Source Model • Model reverse flow • TCP – assume model generates primary packet stream • estimate packet volume in reverse direction for normal ACKs • VoIP – assume symmetric packet flow • IPTV – assume unidirectional packet flow

  5. Base Model - 1 Interfering Source Interfering Source Estimated Queuing Delay Loss Model Stream Limits for queuing delay in each direction AND common delay (i.e. shared queue) Overflow model (i.e. queue length limit)

  6. Base Model - 2 At time t: For each interfering source Probability of being in packet burst = p(b) Decide on a packet burst length Decide on the position within the packet burst Compute contribution that preceding part of packet burst added to queuing delay

  7. Issue 1 If next “t” is close to previous then both events could have occurred in the same packet burst Add: if t within previous estimate of packet burst length then use previously calculated burst parameters

  8. Issue 2 If multiple test stream packets are closely spaced they will add to the queuing delay (i.e. self congestion) Add: incorporate contribution of this packet to queuing delay

  9. Model Interfering Source Interfering Source Interfering Source Interfering Source Test Stream Queue Limit +

  10. Interfering Source Interfering Source Interfering Source Interfering Source Interfering Source Interfering Source Interfering Source Interfering Source Test Stream Test Stream Queue Limit Queue Limit + + Model

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