P802.1CM Simulation Results for. Profiles A &B. János Farkas and Balázs Varga.
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1 P802.1CM Simulation Results for Profiles A &B János Farkas and Balázs Varga janos.farkas@ericsson.com balazs.a.varga@ericsson.com March 16, 2016
2 D0.2 Profiles for CPRI functional Decomposition Profile A Strict priority queuing No specific TSN features A frame carrying CPRI traffic may need to wait 1500 Bytes of non-cpri traffic at each hop Profile B Strict priority queueing Frame preemption No further TSN features A frame carrying CPRI traffic may need to wait 64-Byte fragment or Bytes frame of non-cpri traffic at a hop P802.1CM Profiles A and B Page 2
3 Evaluated Scenarios Tree topologies comprising 10 Gbps links Bridge delay: uniform distribution in the range of [1495ns ns], i.e., bridge delay variation = 10ns Traffic characteristics CPRI IQ data (CBR) Payload: 1500 Bytes or 300 Bytes Nominal CPRI rate: Gbps 8b/10b coding removed, therefore, rate: Gbps VBR background Payload: 1500 Bytes Mean rate: Gbps Traffic source timing inaccuracy: ± 20 ns Topologies are designed for frame racing (collision) P802.1CM Profiles A and B Page 3
4 Scenario 1: Topology 1 & 1500-Byte CPRI uplink Radio Equipment (RE) Radio Equipment Controller (REC) 3. src src P802.1CM Profiles A and B Page 4 src src RE- 4km
5 Scenario 2: Topology 2 & 1500-Byte CPRI uplink Radio Equipment (RE) Radio Equipment Controller (REC) 349m SW-0 src src P802.1CM Profiles A and B Page m src src RE-
6 Scenario 3 Topology 2 & 300-Byte CPRI uplink Radio Equipment (RE) Radio Equipment Controller (REC) 63m SW-0 src src P802.1CM Profiles A and B Page 6 245m src src RE-
7 Scenario 1 Results Topology 1 & 1500-Byte CPRI Profile A src src src src Profile B (preemption) RE P802.1CM Profiles A and B Page
8 Scenario 1 Results Profile A Zoom-in src src src src RE P802.1CM Profiles A and B Page 8
9 Scenario 3 Results Topology 2 & 300-Byte CPRI src src src src Bridge delay variation = 100ns Profile A Profile B (preemption) RE- SW P802.1CM Profiles A and B Page
10 Scenario 2 vs Scenario vs 300 Bytes CPRI Profile A Bytes Profile B (preemption) Bytes P802.1CM Profiles A and B Page Bytes CPRI racing avoided by Delay function
11 Scenario 1 Playout Buffer Profile A src src src src Profile B (preemption) RE P802.1CM Profiles A and B Page
12 Playout Buffer Scenario Bytes SW-0 Profile A src src src src Profile B (preemption) RE P802.1CM Profiles A and B Page 12
13 Summary High priority queue for CPRI Maximum a single background frame is served before CPRI in each hop Frame preemption Decreases FDV Serialization delay of an 1500-Byte frame per hop Allows longer reach Smaller packet size Smaller serialization delay per hop Longer reach in case of store-and-forward Smaller FDV caused by colliding/racing CPRI packets Decreases FLR ( P802.1CM Profiles A and B Page 13
14 Acknowledgements The authors thank Csaba Simon, Markosz Maliosz, József Bíró, Miklós Máté, Árpád Nagy, and István Moldován for their contributions. P802.1CM Profiles A and B Page 14
15 P802.1CM Profiles A and B Page 15
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