Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
1997-08-15
2001-06-05
Legree, Tracy (Department: 2681)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S015000, C455S445000
Reexamination Certificate
active
06243577
ABSTRACT:
BACKGROUND OF THE INVENTION
Low cost Personal Communication Services (“PCS”), which typically include wireless telephone service, paging, and digital data transmission, can succeed commercially only if several conflicting requirements are properly balanced. Among these requirements are low handset cost, low transmission power to extend battery life and permit a lighter handset, good speech quality, and high user density.
At least two forms of PCS are currently available. The first form, Digital European Cordless Telecommunications (“DECT”) standard wireless telephones operate at 1880-1900 MHZ. A U.S. version of DECT, operating at 900 MHZ (ISM band) also exists, and a second U.S. version of DECT operating at 1900 MHZ, called Personal Access Communication Systems (“PACS”) will be available in early 1997. In Japan, a second form of PCS with similar characteristics to DECT is available and is called the Personal Handyphone System (“PHS”). The technical parameters and capacities of these systems are known.
SUMMARY OF THE INVENTION
Broadband wireless access systems operating at millimeter wavelengths including Local Multipoint Distribution Systems (“LMDS”) operating at 28 Ghz and other point-to-multiple-point systems such as Digital Electronic Messaging Systems (“DEMS”) at 24 Ghz can be used to extend the range of PCS systems including DECT, PACS, and PHS as well as providing other operational advantages. LMDS resembles in some respects cellular telephone networks. Each home using LMDS is equipped with a Customer Premises Equipment (“CPE”) unit comprising a narrow beam antenna/millimeter transceiver unit on or at the roof line. Inside the home, a general purpose modem or similar gateway connects the antenna/transceiver unit to various home information appliances, including but not limited to telephones, televisions, and computers. The home antenna/transceiver units in turn communicate with sector hubs, each hub having an antenna, the height of which will vary from 15-25 meters, depending on desired range, local terrain, and local zoning and building restrictions. Each hub is in turn connected to a central office, which may act as a content provider, an interface to the telephone system, or an interface to the Internet.
In a first embodiment of the present invention, each user will have a home gateway that includes an interface to the DECT's or PHS's Fixed Access Unit (“FAU”). The FAU provides the user with a standard telephone socket for connecting conventional analog equipment such as telephones, facsimile machines, modems, and possibly Integrated Service Digital Network (“ISDN”) equipment. The home gateway interface to the PCS FAU provides frequency translation from the DECT/PHS system to the LMDS system. The home gateway will be connected to a CPE unit at roof level. At the hub, the telephony signal will be received from the LMDS system and connected to a DECT/PHS base station through an interface that provides the necessary frequency translation.
In a second embodiment of the present invention, LMDS is used to provide a cost-effective home use option for users of known cellular telephones and PCS users. In this embodiment, when cellular telephone or PCS users are outside their homes, their handsets transmit and receive signals to and from the host cellular/PCS site. Operation is conventional and known in this second embodiment when the user is outside the home environment. Inside a house, the PCS or cellular telephone no longer sends and receives signals to and from the host cellular/PCS site. Instead, a special channel is used which is dedicated to indoor use and a picocell unit transmits and receives signals from the PCS or cellular telephone user and translates the signals up to or down from the LMDS frequency range. In turn, the picocell unit communicates with an LMDS cell. The LMDS cell is coupled to a cellular or PCS cell site, which in turn can be coupled to a mobile telephone switching office.
REFERENCES:
patent: 5081703 (1992-01-01), Lee
patent: 5303287 (1994-04-01), Laborde
patent: 5406615 (1995-04-01), Miller, II et al.
patent: 5604789 (1997-02-01), Lerman
patent: 5734982 (1998-03-01), Endo et al.
patent: 5812951 (1998-09-01), Ganesan et al.
patent: 6047177 (2000-04-01), Wickman
patent: 0 468 688 A2 (1992-01-01), None
patent: 0786876A2 (1997-07-01), None
Elrefaie Aly F.
Mattes Hans George
Hewlett-Packard Corporation
Legree Tracy
LandOfFree
Frequency translation to local multi-point distribution... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Frequency translation to local multi-point distribution..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Frequency translation to local multi-point distribution... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2497990