1. 3GPP2 TSG-C SWG1.2 Maui, HI C12-20051205-015R2/C30-20051205-044 1 of 12 TSG-C WG3/SWG1.2 joint meeting 12/07/05 BCMCS FEC evaluation simulation requirements

2. 3GPP2 TSG-C SWG1.2 Maui, HI C12-20051205-015R2/C30-20051205-044 2 of 12 Background for WG3 Application layer FEC considered for file delivery and streaming services Simulations required of overall performance for different services using different configurations of physical, link and application layers Most evaluation criteria agreed: –Bearer bit-rates, link layer interleaving options, link layer Reed-Solomon coding –Steaming services, file sizes etc. etc.

3. 3GPP2 TSG-C SWG1.2 Maui, HI C12-20051205-015R2/C30-20051205-044 3 of 12 Requirements SWG1.2 requires loss trace files for physical layer performance Traces should give raw Broadcast MAC packet loss patterns (before interleaving and link layer RS decoding) –Abbreviate “Broadcast MAC packet” as “BMP” –Traces should provide “BMP loss patterns” Open issues: –required physical layer configuration (i.e. bit-rate) –radio conditions (i.e. geometry) –Trace durations

4. 3GPP2 TSG-C SWG1.2 Maui, HI C12-20051205-015R2/C30-20051205-044 4 of 12 Required bit-rates “Ideal” application layer FEC can make use of every correctly received BMP for application layer data –“effective throughput” = bearer bit-rate x (1 – BMP loss rate) For a given geometry, simulations must include configurations for which this effective throughput is maximised –This may include cases where the BMP loss rate is relatively high

5. 3GPP2 TSG-C SWG1.2 Maui, HI C12-20051205-015R2/C30-20051205-044 5 of 12 Range of bit rates per geometry For a given geometry –Start with highest bit-rate that achieves ~0 BMP loss rate –Produce traces for this bit-rate and higher bit- rates until above the rate that achieves maximum effective throughput for that geometry –If rate that achieves maximum effective throughput is not known or easily calculated, then provide traces until maximum bit-rate

6. 3GPP2 TSG-C SWG1.2 Maui, HI C12-20051205-015R2/C30-20051205-044 6 of 12 Required geometries Broadcast transmissions must be configured to provide service to users at the ‘edge’ of coverage –=> FEC simulations should consider this operating point Maybe different opinions on what is the ‘edge’ ? –=> consider a small number of different geometries Advice needed from WG3 on the appropriate geometries (and any other physical layer simulation parameters ?)

7. 3GPP2 TSG-C SWG1.2 Maui, HI C12-20051205-015R2/C30-20051205-044 7 of 12 Summary or required cases Bit rate Geometry (decreasing) Cases with ~0 BMP loss rate Cases with max effective throughput “edge” of coverage

8. 3GPP2 TSG-C SWG1.2 Maui, HI C12-20051205-015R2/C30-20051205-044 8 of 12 Trace duration Streaming services may target a Mean Time Between FEC Artifacts (MTBA) of hundreds or thousands of seconds –e.g. 3GPP evaluation used MTBA of 1 hour Statistical significance of results depends on number of observed events Trace duration of 24 hours would be sufficient –May be limited by practical constraints: 24 hours trace for 2.5Mbit/s at 1 byte of trace data per BMP is > 200MB