Distributed antenna system for commercial telephone and Wi-Fi service

{
  "publication_number": "US10742270B1",
  "country": "US",
  "kind": "B1",
  "title": "Distributed antenna system for commercial telephone and Wi-Fi service",
  "abstract": "An integrated antenna distributed system incorporates various types of communication signals, such as mobile communication signals, public safety signals, Wi-Fi signals, and other types of communication signals. Such a system uses a single reference signal to support MIMO using a single optical cable or a single fiber optic cable, and a signal from a remote location, to support commercial telecommunication services and Wi-Fi services simultaneously. The reference signal is used for frequency stability of remote units (RUs) connected to the head end (HE). For example, a reference signal is selected and sent from the HE to RUs, a bandwidth and frequency conversion of signals to be transmitted is specified and/or performed, a RU receives the converted signals and the reference signal from the HE, where the converted signals may be frequency or band-constrained, and the converted signals are converted at the RUs back to their original frequencies or bands.",
  "claims": [
    "1. A Distributed Antenna System (DAS) for Wi-Fi signals, the DAS comprising: a Head End (HE) configured to receive RF signals from at least one of a base station, a gateway, or a router, wherein the HE comprises a frequency shifter for converting frequencies of signals; and a plurality of Remote Units (RUs) each respectively connected to the HE over a single fiber optic cable, wherein each of the RUs comprises a frequency shifter for converting frequencies of signals; and a multiband combiner configured to bundle multiple signals together; wherein the frequency shifter of the HE is configured to convert a downlink (DL) signal having a frequency in a DL frequency spectrum to a signal having a frequency in an Uplink (UL) frequency band when the HE transmits the DL signal to the RUs in a multi-band spectrum, and the frequency shifter of each of the RUs is configured to convert a UL signal having a frequency in a UL frequency spectrum to a signal having a frequency in a DL frequency band when the RU transmits the UL signal to the HE in a UL frequency spectrum.",
    "2. The DAS of claim 1, wherein the HE is configured to receive massive MIMO signals from the at least one of the base station, the gateway, or the router, and the frequency shifter of the HE is configured to convert an original frequency of the received massive MIMO signals to one or more converted frequencies for transmitting the massive MIMO signals to one or more of the RUs.",
    "3. The DAS of claim 2, wherein the frequency shifter of the HE is further configured to transmit the massive MIMO signals with the converted frequencies to the one or more of the RUs.",
    "4. The DAS of claim 2, wherein the frequency shifter of the one or more of the RUs is configured to re-convert the one or more converted frequencies of the massive MIMO signals transmitted from the HE back to the original frequency of the received massive MIMO signals.",
    "5. The DAS of claim 2, wherein at least one of the frequency shifter of the HE or the frequency shifter of at least one of the RUs comprises an analog modulator.",
    "6. The DAS of claim 1, wherein the HE is configured to receive a high capacity Ethernet signal from the at least one of the base station, the gateway, or the router, and the frequency shifter of the HE is configured to convert an original frequency of the received high capacity Ethernet signal to a general commercial frequency band.",
    "7. The DAS of claim 6, wherein one of the frequency shifter of the HE or the frequency shifter of one of the RUs is further configured to re-convert the frequency of the high capacity Ethernet signal transmitted from the HE from the general commercial frequency band back to the original frequency.",
    "8. The DAS of claim 6, wherein the HE further comprises an apparatus configured to convert a frequency of an Ethernet signal received through an Ethernet cable from the at least one of the base station, the gateway, or the router to a Wi-Fi frequency.",
    "9. The DAS of claim 6, wherein the HE further comprises an apparatus configured to convert a frequency of an Ethernet signal received from the at least one of the base station, the gateway, or the router to an arbitrary channel frequency within a Wi-Fi frequency band.",
    "10. The DAS of claim 6, wherein at least one of the frequency shifter of the HE or the frequency shifter of at least one of the RUs comprises an analog modulator.",
    "11. The DAS of claim 1, wherein the HE further comprises an RF module for adjusting the RF signals received from the at least one of the base station, the gateway, or the router.",
    "12. The DAS of claim 11, wherein the RF module and the frequency shifter of the HE are formed in a single module in the HE.",
    "13. The DAS of claim 1, wherein the HE further comprises a reference signal generator for generating a reference signal, and wherein the reference signal generator is configured to use a single reference signal in a multi-band spectrum when the HE is connected to the plurality of RUs.",
    "14. The DAS of claim 13, wherein the HE and the each of RUs each comprises a prescaler or a frequency divider for matching a reference frequency of the RU to a frequency of the reference signal.",
    "15. The DAS of claim 1, further comprising a frequency conversion unit configured to simultaneously transmit signals from a general commercial telephone service apparatus and signals from a Wi-Fi service apparatus to the RUs using a single medium.",
    "16. The DAS of claim 15, wherein the single medium comprises a fiber optic cable or a coaxial cable.",
    "17. The DAS of claim 1, wherein at least one of the frequency shifter of the HE or the frequency shifter of at least one of the RUs comprises an analog modulator.",
    "18. The DAS of claim 1, further comprising a device configured to use a frequency conversion scheme to simultaneously transmit signals from a common commercial telephone service device and signals from a Wi-Fi service device using at least one of a frequency division duplex (FDD) method or a time division duplex (TDD) method over a single medium.",
    "19. The DAS of claim 18, wherein the single medium comprises a fiber optic cable or a coaxial cable.",
    "20. The DAS of claim 1, wherein the multiband combiner comprises a device that utilizes a commercial telephone service frequency band and a device for bundling a 2.4 GHz Wi-Fi band and a 5 GHz Wi-Fi band."
  ],
  "description_excerpt": "Embodiments of the present invention relate generally to a distributed Antenna System (DAS), and more specifically to an integrated distributed Antenna System (DAS) that integrates various types of communication signals such as mobile communication signals, public safety signals, Wi-Fi signals, and other types of communication signals.\n\nMobile communications continue to develop, where improved mobile communication infrastructures coexist with diverse types of mobile communication networks, and are provided with second generation, third generation, and fourth generation services. Multi-Band Multi-Mode systems are generally required to support and connect these various kinds of networks. These multi-band multi-mode systems have a need to cover all of the communication networks corresponding to multiple bandwidths, or deliver large amounts of signals to deliver various services.\n\nIn the United States, in an environment where diverse communication services are provided and diverse kinds of communication terminals are supplied, telecommunications operators and landlords are working to provide the best quality service to customers or tenants. Typically, operators try to resolve or improve areas of shade, or low and/or no signal, in buildings. Shaded areas are areas where the communication signals may not be transmitted or otherwise communicated properly.\n\nShaded areas or other areas with weak or no signal can generally be removed, for example, by installing base stations and antenna dispersion devices in the shaded area, or by installing one or more Bi-Directional Amplifiers (BDAs) and antenna dispersion devices.",
  "cpc": [
    "H04B 7/024",
    "H04B 7/0452",
    "H04B 7/0456",
    "H04L 25/00",
    "H04L 5/0023",
    "H04L 5/1423"
  ],
  "ipc": [
    "H04B 7/024",
    "H04B 7/0452",
    "H04B 7/0456",
    "H04L 5/14"
  ],
  "assignees": [
    "Advanced RF Technologies Inc"
  ],
  "inventors": [
    "Dae Woong Kim"
  ],
  "filing_date": "2019-06-13",
  "publication_date": "2020-08-11",
  "grant_date": "2020-08-11",
  "priority_date": "2019-03-04",
  "application_number": "US-201916440502-A",
  "family_id": "71993985",
  "cited_by_count": 12,
  "citations": [
    "US6014372A",
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    "US10383171B2",
    "US10270553B2",
    "US10200267B2"
  ]
}