{"id":9648,"date":"2014-05-03T11:16:18","date_gmt":"2014-05-03T10:16:18","guid":{"rendered":"http:\/\/catai.net\/blog\/?p=9648"},"modified":"2014-09-21T13:57:47","modified_gmt":"2014-09-21T12:57:47","slug":"bluetooth-version-4-1-history-wmts-emi","status":"publish","type":"post","link":"https:\/\/catai.net\/blog\/2014\/05\/bluetooth-version-4-1-history-wmts-emi\/","title":{"rendered":"Bluetooth version 4.1. History."},"content":{"rendered":"

\"MediaTek<\/p>\n

In the year 2000<\/strong>, the\u00a0Federal Communications Commission (FCC)<\/strong>\u00a0has solved\u00a0the concerns about electromagnetic interference (EMI<\/a>) from a variety of other licensed radio users (i.e emergency medical technicians or police) \u00a0dedicating a portion of the radio spectrum:\u00a0608-614 MHz, 1395-1400 MHz and 1427-1432 MHz, for wireless medical telemetry devices.<\/p>\n

\n

WMTS<\/span><\/a><\/strong><\/span>\u00a0 (wireless medical telemetry services<\/a>) was approved for any biomedical emission appropriate for communications, except voice and video.\u00a0<\/span>Transmitters\u00a0operating in the WMTS bands had been registered with\u00a0ASHE (American Society for Healthcare Engineering )\u00a0to ensure interference-free operation and \u00a0notify users of potential frequency conflicts. At that time although some vendor supported\u00a0802.11<\/span><\/a>\u00a0WIFI or Bluetooth<\/span><\/a>, both the FCC and the Food and Drug Administration (FDA) encourage the use of WMTS.<\/p>\n<\/blockquote>\n

Since 2009<\/strong> the 802.11n<\/strong>\u00a0WIFI covered more then 76% of all wireless access point.<\/p>\n

Medical WIFI in Hospitals<\/strong> became the main source for:<\/p>\n

    \n
      \n
    1. Guest services<\/li>\n
    2. Real time location<\/li>\n
    3. Remote video access<\/li>\n
    4. Support telemedicine<\/li>\n
    5. Offer voice over wifi<\/li>\n
    6. Accomodate Wireless medical devices<\/li>\n
    7. Access EHR (electronical health records) and other healthcare applications<\/li>\n<\/ol>\n<\/ol>\n

      This was further increased with BYOD<\/a> (bring your own device) phylosophy and FCC expected by 2013 to run out of spectrum that could seriously limited the QoS required in medical applications and roaming movility.<\/p>\n

      For that reason 802.11r<\/strong> appeared and solved this problem together with the micro-cells that provide a very dense WIFI networks. An furthermore the\u00a0802.11h<\/strong> amendment from IEEE assure that 4 GHz band do not interfere with radar stations. Finally the 802.11u<\/strong> ready by 2011 improved the internetworking and rooming.<\/p>\n

      Since 2012<\/strong> the FCC reserved the MEDICAL PERSONAL AREA NETWORK<\/strong> and with Continua Health Alliance is providing wireless certification program for medical devices.<\/p>\n

      mHealth Alliance<\/strong> have defined since then mHealth<\/strong><\/span> as the medical and public health practice suported by mobile medical devices. At that point REGULATIONS IN THE NEW MEDICAL HEALTH<\/a> essentially consider mHealth and the current medical telemetry bands were:<\/p>\n

      \"\"<\/a><\/p>\n

      Low energy solutions for wearable sensors exploted at that time.\u00a0Body Area Network<\/strong>\u00a0is formally defined by IEEE 802.15 as, “a communication standard optimized for low power devices and operation on, in or around the human body (but not limited to humans) to serve a variety of applications including medical, consumer electronics \/ personal entertainment and other<\/em>”\u00a0[IEEE 802.15]<\/a>.<\/p>\n

      The WG6 specifications\u00a0IEEE\u00a0802.15.6<\/a>\u00a0also know as WBAN<\/strong> (wireless Body area network) was ready in 2012. \u00a0It supports quality of service (QoS), extremely low power, and data rates up to 10 Mbps complying with\u00a0strict non-interference guidelines<\/strong>.\u00a0It\u00a0supports a variety of frequency bands including \u00a0868-868.6 MHz, – 802-928 MHz, – 2400-2483.5 MHz, – 314-316 MHz, 430-434 MHz, and 779-787 MHz band for LR-WPAN systems in China, and – 950 MHz-956 MHz in Japan.\u00a0The standard take into consideration body interactions of portable antennas (varying with male, female, skinny, heavy, etc.), radiation pattern shaping to minimize the specific absorption rate (SAR)<\/strong> into the body, and changes in characteristics as a result of the user motions.<\/p>\n

      \"Power<\/p>\n

      IEEE 802 <\/span> Working Groups and Study Groups<\/h2>\n