Mitigating Interference in the Network & Status Carrier ID Standardization
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The document discusses strategies for mitigating interference in network status with a focus on carrier ID standardization. It examines the impact of RFI on various ACM implementations and emphasizes the advantages of ACM for variable bitrate services. Additionally, it compares two types of carrier IDs: NIT and RF, noting their different adoption rates and technical specifications.
Mitigating Interference in the Network & Status Carrier ID Standardization
- 1. Mitigating Interference in the Network Status Carrier ID Standardization WBU-ISOG Forum, May 30th, 2012 Steven Soenens Director, Product Marketing Broadcast [email protected] Broadband Systems Professional Equipment IP Software
- 2. Agenda • Mitigating Interference in the Network • Status Carrier ID Standardization 2 © Newtec Cy nv – All Rights Reserved. Newtec confidential and proprietary information
- 3. DVB-S2 Adaptive Coding and Modulation (ACM) Bad weather conditions ModCod: 8PSK 5/6 -6dB Throughput 36MHz : 73 Mbps Good weather conditions ModCod: 32APSK 9/10 Throughput 36 MHz: 120 Mb/s ACM ACM Controller client Modulation Demodulation Feedback mechanism (terrestrial or satellite) * Typical improvements 3
- 4. The answer is …”depends” Yes … RFI impacts QoS “similar” like rain fades do But … RFI is different in a sense that the impact is • Not regional like rain fades are • Also occur on C-Band … so the benefits of ACM really depend on: • The ACM implementation (algorithm) • Type of Services » Fixed bitrate (live video) » Variable bitrate (video files, IP, …) 4
- 5. How traditional ACM use cases react on RFI FlexACM Shared Rate (Classic ACM) • Drops in link quality affect service rates of other sites. • Services (can be but don’t have to be) mapped in same ISSY • Works only for variable bitrate services (video files, IP data) RFI impacts ‘all’ locations, so this ACM scenario may reduce impact of RFI for variable bitrate services FlexACM Independent Rate • Drops in link quality do NOT affect service rates of other sites • Separate ISSY for every terminal or “Service Group” (regional bouquet) • Allows geographical statistical multiplexing on weather conditions Less applicable since many locations affected at the same time by RFI FlexACM Fixed Rate (e.g. video) • Drops in link quality does not affect any service rate & are buffered by margin • The margin and CIR is dependent on impact of RFI • Margin can be used for opportunistic data (variable bitrate) Less applicable since difficult to estimate 5 required margin for RFI interferences
- 6. Conclusions • ACM can be useful to reduce the impact of RFI • Networks with ACM are more robust against RFI • Best fit for variable bitrate services – Data applications – Video applications with variable rate • File transfers • X-layer video optimized services (e.g. SNG) 6
- 7. Agenda • Mitigating Interference in the Network • Status Carrier ID Standardization 7
- 8. Status Carrier-Identifier (CID) Standardization • A carrier identifier (Carrier ID) is inserted in the uplink modulator or SNG encoder/modulator Insert CID Compression Remove CID Re-Insert CID • Two versions of Carrier ID in video and data applications : – NIT Carrier ID: faster adoption in the industry – RF Carrier ID : slower adoption in the industry • Each version has it advantages and disadvantages 8
- 9. RF CID versus NIT CID : Complementary technologies NIT Carrier ID RF Carrier ID Standards Availability WBU-ISOG specification (2009) DVB expects standard end of 2012 (No MAC address in CID) (Requirements and specs are under definition) Transponder and Carrier Requires MPEG-TS (~Video) Agnostic to traffic carrier or transport Compatibility * Broadcast Contribution mechanism * Broadcast Distribution * Video and Data transport focused Changes to original signal Yes (NIT table) “None”, second carrier is overlay to the original carrier Robustness Low - CID not recoverable if main Higher, can be decoded even if main carrier is down carrier is jammed Injection point Modulator or (SNG) encoder Modulator ACM and ULPC compatibility Yes Yes Carrier ID decode speed Typical 2 seconds (25msec-10sec) May take up to 1 minute Cost of modulator “No” additional cost Higher Cost of decoder “No” additional cost Higher (dedicated equipment) Network Access to Carrier ID Everywhere the network, even on By satellite operator predominantly any IRD and set top box (Dedicated decoder receiver required) Ease of deployment Modulator : SW upgrade Mod : SW upgrade only ? OTS TS analysers/monitoring eq. Dedicated Receiver/Decoders IRD’s in the future? 9
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