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Date: 2009-03-11

Common Mode Signaling (CMS) for Intersystem Coexistence Enhancement. Date: 2009-03-11. High Level Summary.

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Date: 2009-03-11

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  1. Shu Kato Common Mode Signaling (CMS) for Intersystem Coexistence Enhancement Date: 2009-03-11

  2. Shu Kato High Level Summary • The Common Mode Signaling (CMS): specified to enhance intersystem coexistence in the IEEE 802.15.3c (TG3c) system design by transmitting and receiving a specific frame (synch frame) with much higher detection capability than “energy detection” in very low C/N environments • The outline of this document: • Two important items for coexistence • Overview on TG3c system design • The importance of intersystem coexistence • What is CMS • How does CMS enhance intersystem coexistence • CMS frame format • Design specifications of CMS • CMS performances • TG3c-Tgad coexistence using CMS

  3. Shu Kato Two Important Items for Coexistence • Channelization i. The same channelization: must for better coexistence of multiple systems in the same frequency band ii. 802.15.3c adopts a channelization of “4 channels over 9 GHz” and this has been accepted by WirelessHD and adopted by ECMA as well – better to use the same channelization as specified by TG3c • “In-use channel “ detection capability i. Proposing “in-use channel detection by a specific frame transmission and detection” – Common Mode Signaling (CMS) transmission and reception ii. “In-use channel detection” by CMS transmission and reception: much better sensitivity than “energy detection”

  4. TG3c Channel Plan 2160 MHz 1728 MHz 120 MHz 240 MHz 1 2 3 4 57 58 59 60 61 62 63 64 65 66 fGHz • Support Cell phone XTAL: 19.2 MHz & 26 MHz & Other High frequency XTALs: 40MHz, 54MHz, 60MHz, 108MHz, … • Balanced margins to 57/66 GHz & Good roll-off factor • Supports Multiple PLL Architectures with the Cell phone XTAL • Dual PLL: High frequency PLL that generates carrier frequencies • Low frequency PLL that generates ADC/DAC & ASIC frequencies 4 4

  5. Common Mode Signaling (Simple Single Carrier bridging different air interfaces) • All PNC capable devices regardless PHY, shall support CMS, Synch frame transmission and reception capability • CMS: to enhance coexistence of different air interfaces which will be best suite to separate market segments • CMS: simple single carrier (p/2 BPSK with Reed Solomon as FEC) for robust and longer transmission range Common Mode Signaling Single Carrier PNC (DEVs) OFDM (PNC) CMS: Single Carrier Beacon (p/2 BPSK with RS as FEC)

  6. Shu Kato Overview on TG3c System Design • One unified MAC • Three PHYs optimized for respective and specific market segments • Single carrier (SC) PHY • low complexity, low power consumption and low cost • handheld mobile applications • High speed interface (HSI) PHY - OFDM • low latency bi-directional data communications • PC peripherals • AV PHY - OFDM • optimized for high speed uncompressed video transmission • Audio/visual consumer electronics (CE) applications

  7. Shu Kato The Importance of Intersystem Coexistence • Multiple PHY modes are specified in the TG3c system to address respective application and market segments • If these PHY modes do not recognize each other, they may interfere mutually and the overall performance will be degraded • All PHY modes compliant to the TG3c system design shall not interfere with each other • CMS is a signaling scheme specified to facilitate enhanced intersystem coexistence within the TG3c system

  8. Shu Kato What is CMS • CMS is a low data rate single carrier (SC) signal specified for intersystem coexistence purposes • The CMS is used for SC PHY transmission of • Beacon frame and sync frame • Command frame and training sequence in beam forming • Several rules are specified for the usage of CMS to enhance intersystem coexistence

  9. Shu Kato How does CMS enhance Intersystem Coexistence • The below rules on CMS usage are specified in the TG3c draft: • An AV or an HSI PNC shall send a CMS sync frame in every superframe • An AV or an HSI PNC shall be able to receive the CMS sync frame • An SC PNC shall send CMS beacon in every superframe • All SC DEV shall be able to send and receive signal in CMS • The specified rules indicate that all PHY modes are able to communicate with / detect each other using a commonly supported signaling scheme • Any new PNC seeking to start a piconet, shall initially perform channel scan. Upon receiving CMS beacon/sync frame from an already-active PNC, this new PNC will be aware of its existence and shall avoid interfering signal transmission

  10. Shu Kato CMS frame format CES 6 repetition of Golay code length 512 + Golay code length 128 SFD 4 repetition of Golay code length 512 RS parity bits 16 octets HCS 2 octets MAC header 10 octets Payload Frame header PHY preamble PHY header 5 octets SYNC 128 repetition of Golay code length 128 SYNC – Synchronization SFD – Start frame delimiter CES – Channel estimation sequence HCS – Header check sequence RS – Reed-Solomon

  11. Shu Kato Design specifications of CMS • Preamble • Total duration ~12.6us: SYNC ~9.5us, SFD ~1.2us, CES ~1.9us • Spreading: 128 • Modulation: p/2-shift BPSK • Header • Forward error correction: Reed-Solomon (33,17) • Spreading: 64 • Modulation: p/2-shift BPSK • Header rate: 12.3 Mbps • Payload • Forward error correction: Reed-Solomon (255,239) • Spreading: 64 • Modulation: p/2-shift BPSK • Data rate: 25.3 Mbps

  12. Shu Kato CMS Performance The CMS is capable of achieving transmission range of 32.8m in AWGN channel and 10.3m in residential NLOS environment (CM2.3)

  13. Shu Kato TG3c-TGad Coexistence using CMS • The intersystem coexistence using CMS has the potential to be extended beyond coexistence for multiple PHY modes within TG3c system • Other systems occupying the same frequency band (e.g. TGad system) may also utilize the CMS to further enhance the coexistence capability for a more harmonized communication environment

  14. Shu Kato Conclusion • The enhanced intersystem coexistence mechanism using CMS in TG3c system is described • CMS realizes intersystem co-existence much better than the conventional detect and avoid (DAA) technology based on energy detection • CMS is a good candidate for harmonized multiple system coexistence in the same frequency band, 60 GHz

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