Bande Ism

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Bande Ism

  1. 1. BANDE ISM Industrial, Scientific and Medical 1
  2. 2. Chi è? Heinrich Rudolf Hertz (22 febbraio 1857 – 1 gennaio 1894) 2
  3. 3. SRD (Short Range Devices) SISTEMI A RADIOFREQUENZA, CON NORMATIVA DEFINITA IN AMBITO EUROPEO PER LIBERO UTILIZZO Bande disponibili per libero utilizzo: 433.05 ÷ 434.79 Mhz Utilizzo Generico 863 ÷ 865 Mhz Audio 868 ÷ 870 Mhz Sotto Bande specializzate 2.4 ÷ 2.5 Ghz Dati,Video, Reti Lan, BlueTooth, WiFi, Zig Bee… 3
  4. 4. Scelta della banda in funzione delle esigenze del prodotto • Quanta strada devo fare? • Cosa devo trasmettere? • Quanto posso consumare? • E’ una soluzione semplice? • Quanto spazio ho? • Quanto costa? 4
  5. 5. Utilizzo tipico delle bande 434 MHz Telecomandi codificati Telemetria dati low speed 863 MHz Audio con normativa specifica 868 MHz Telecomandi codificati Telemetria dati low speed Specializzazione bande sia come duty cycle che come potenza 2.4 GHz Possibile ampia banda passante per reti dati. Massima complessità del sistema RF sia come hardware (tecniche di modulazione), sia come software (reti complesse). 5
  6. 6. Short Range Devices: CEPT (Conférence européenne des administrations des postes et des télécommunications) Reserved Frequencies (434 Mhz) 10 mW ERP 10 mW ERP 1 mW ERP 433.05 434.04 434.79 433.0 434.0 435.0 Duty Cycle up to 100%, No channel spacing. Power density limited to -13dBm/10Khz for wideband channels with a bandwidth greater than 250Khz. Max Duty Cycle 100% , channel spacing up to 25Khz Max Duty Cycle 10% , No channel spacing Telemetry, Telecommand, Alarms, Data in general and other similar applications. The band is also designed for industrial, scientific and medical (ISM) application as defined in ITU Radio Regulation. Audio and voice signals should be avoided in the band 433.050÷434.79 Mhz. Antenna Type: integral or dedicated 6
  7. 7. Audio Short Range Devices: Reserved Frequencies (863÷865 Mhz) Allowed antenna type integral or dedicated 10 mW ERP 10 mW ERP 863 864 865 Wireless Audio Applications – Duty cycle up to 100%, No channel spacing. In case of analogue systems the max occupied bandwidth should not exceed 300 Khz. Narrow band analogue voice devices (such as baby voice monitors, door entry systems etc ) should only use the band 864.8-865 MHz with duty cycle up to 100% and 50 Khz channel spacing. Radio microphones – Duty cycle up to 100%, 200 Khz channel spacing. In case of analogue systems the maximum occupied bandwidth should not exceed 300 kHz 7
  8. 8. Short Range Devices: CEPT Reserved Frequencies (868Mhz) ERP 500 mW Antenna type: integral or dedicated 25 mW 10 mW 5 mW ERP 869.2 869.3 869.4 869.65 869.0 868.0 868.6 868.7 Telecommand, Alarms, Data,…) 869.25 869.7 Non-specific SRD (Telemetry, Max duty cycle 1%, No channel spacing. Below 868.5 Mhz the usage of a dedicated frequency channel is avoided and a technology that allows automatic channel selection of a free channel within the band should be used. Max duty cycle 0.1%, No channel spacing. Channel spacing 25Khz. An appropriate access protocol should be used (EN XXX XXX). No restriction on duty cycle Max duty cycle 10%, 25 Khz channel spacing. The whole band may also be used as 1 channel for high speed data transmission. Duty cycle up to 100%. No channel spacing. The adjacent frequency band above this band has been designated for use by the high powered TETRA service. Manufacturers should take this into account in the design of the e.i.r.p. Max duty cycle 0.1%, 25Khz channel spacing. May also be used as 1 channel for high speed data and for security) Alarms (general transmissions Max duty cycle 0.1%, 25Khz channel spacing. Frequency band 869.20 ÷ 869.25 is for social alarms Max duty cycle 10%, 25Khz channel spacing. 8
  9. 9. CEPT Reserved Frequencies 2.4 GHz 500 mW EIRP 100 mW EIRP 10/25 mW EIRP MHz 2440 2400 2483.5 2446 2454 No restrinction on duty cycle. No channel spacing. 10 mW EIRP Telemetry, Telecommand, Alarms, Data in general. Video applications. Industrial, scientific and medical (ISM) application as defined in ITU Radio Regulation. 25 mW EIRP Equipment for Detecting Movement and Equipment for Alert. No restriction on duty cycle. No channel spacing. Wideband data transmission systems: Radio Local Area Networks. For direct sequence spread spectrum the maximum spectrum power density is limited to -20 dBW/1 MHz. For FHSS the maximum spectrum power density is limited to –10 dBW/100 kHz. Railways applications (Automatic Vehicle Identification). No restriction on duty cycle.Transmitting only in presence of trains. 5 channels, each 1.5 MHz wide. RFID applications (Frequency Hopping Spread Spectrum (FHSS) techniques should be used as means of mitigation when more than 500 mW EIRP is used.): 500 mW EIRP, duty cycle up to 100%. No channel spacing. 4 W EIRP, duty cycle < 15 %. Power levels above 500 mW are restricted to use inside the boundaries of a building and the duty cycle shall in this case be <= 15 % in any 200 ms period (30 ms on /170 ms off). 9
  10. 10. FORNITORI DI RIFERIMETO - Transceivers ADF702x ATA542x CYRF6936 EM250 MC1319x, MC1320x, MC1321x MICRF50x CC1100, CC1150, CC2500, CC2550 10
  11. 11. MODULI XTR CYP 2.4GHz TRX – 433/868 11
  12. 12. Protocollo e applicazioni Tecnologia Bluetooth E’ stata pensata per: •Comunicazioni a corto raggio •Essere utilizzata da dispositivi dotati di batterie •Supportare sia traffico voce che dati •Essere utilizzata in tutto il mondo (banda ISM) E’ caratterizzata da: •Basso costo •Basso consumo di potenza •Affidabilità •Specifice aperte 12
  13. 13. Modulazione: Frequency hopping pseudocasuale 79 canali da 1MHz Slot temporali da 625us Piconet: Due o più dispositivi (max 7 attivi) Architettura a stella Profili: definiscono i requisiti necessari per Permettere l’interoperabilità fra le applicazioni. Sicurezza del canale: Pairing, autenticazione, cifratura Autorizzazione 13
  14. 14. MODULI National STMicroelectronics 14
  15. 15. GRAZIE!!! 15

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