|Publication number||USRE34796 E|
|Application number||US 08/051,925|
|Publication date||Nov 22, 1994|
|Filing date||Apr 26, 1993|
|Priority date||Sep 5, 1989|
|Also published as||DE69032053D1, DE69032053T2, EP0416872A2, EP0416872A3, EP0416872B1, US5021801|
|Publication number||051925, 08051925, US RE34796 E, US RE34796E, US-E-RE34796, USRE34796 E, USRE34796E|
|Inventors||John M. Smith, Joseph J. Schuler|
|Original Assignee||Motorola, Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (11), Non-Patent Citations (2), Referenced by (36), Classifications (9), Legal Events (3)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This invention relates generally to the switching of antennas. More particularly, this invention relates to the routing of radiotelephone transmissions from a transmitter to a particular antenna in a cellullar radiotelephone system.
Cellular radiotelephone cells typically consist of a number of transmitters that transmit, in either omnidirectional or directional antenna patterns, from the cell. The highest capacity cells use directional antennas, dividing the cell into sectors. A major metropolitan area can consist of a large number of these cells. The cells are linked to the land telephone line allowing mobile radiotelephone users to access the land telephone lines and vice versa.
Using the cellular radiotelephone system, a mobile radiotelephone user can travel across a metropolitan area while keeping in contact with the land telephone lines. As a mobile user travels through an area, he may travel through more than one sector of a cell or, depending on the distance traveled, more than one cell. The cellular system takes care of handing off the user's call to another sector or cell.
The mobility of the user means that the sectors within a cell could have widely varying demand at any given time. This variability could cause some sectors to become overloaded while other sectors may have excess capacity. Presently, when a sector has more users than it can handle, the users trying to communicate in that sector are either shifted to another sector or they must wait for a frequency to become free.
Cellular base station receivers are diversity receivers which require 2 antenna inputs. In sector receive configurations, the 2 receiver inputs come from one even and one odd numbered sector that are adjacent. In order to route these 2 inputs from the odd or even antenna to the receiver, a configuration of passive splitters and matrix switches is used. The passive splitter splits the signal from the antenna into multiple signals to be handled by different receivers. The switch matrix switches the signals to the appropriate receivers. This configuration does not allow receivers to handle signals from any sector in the cell. Each receiver can only receive from the odd or even sector matrix to which it is assigned.
Each sector of a cell typically has a single antenna for transmitting. In order to transmit on multiple frequencies in that sector, therefore, multiple transmitters must be combined on that single antenna. FIG. 1 illustrates the present method of combining transmitters onto an antenna. The transmitters (A) produce a signal that is amplified (B) and passed through a combiner (C). The combiner (C) merges the signals allowing a number of transmitters (A) to transmit on one antenna (E).
The combiner (C) contains resonant cavities which each allow only one frequency at which the cavity is tuned to pass to the antenna (E). The cavities are manually tuned to a certain frequency which can only be changed by manually retuning the cavity. Therefore, only a limited number of fixed tuned frequencies can be transmitted from present sector cell configurations.
Because mobile traffic is not distributed evenly, it is continuously changing in number and location, and present transmitter hardware is limited to a fixed number of frequencies within a sector, there exists a need to move underutilized transmitters and/or frequencies from sector to sector with varying traffic demands.
The antenna switching system includes at least one transmission source. The signals from the transmission source are switched to the appropriate antenna by a switch matrix. A broadband combiner, located between the switch matrix and the antennas, combines the switched signals into a single output. In some system applications, additional amplifiers are not needed and the output from the combiner is directly connected to an antenna. However, a highly linear amplifier is required between the combiner and the antenna if a higher power output level is required at the cell site.
The switch matrix can route any or all transmitters to any of the sector antennas that are handling mobile users, accommodating in real time the traffic demand. This will increase the number of frequencies in those sectors, thereby allowing the cell site to handle more mobile traffic without increasing the number of transmitters.
FIG. 1 is a block diagram of the prior art;
FIG. 2 is a block diagram of one embodiment of the present invention with a single base station;
FIG. 3 is a diagram of a cell site with 60° sectors;
FIG. 4 is a block diagram of an alternate embodiment of the present invention with multiple base stations; and
FIG. 5 is a block diagram of an alternate embodiment of the present invention.
The antenna switching system provides dynamic frequency allocation in a cell. In other words, a transmitter can be switched to other sectors in a cell on demand. This is accomplished by the use of a switch matrix similar to the matrix used in the receive portion of a cell. For proper operation, however, this transmit matrix is used in conjunction with a linear power amplifier and a single combiner.
FIG. 2 shows a single base station with the capability of switching between all odd and even sectors of a cell. The odd/even sector configuration of a cell is illustrated in FIG. 3. The odd/even sector switch (201) may be used when a mobile user (301) travels between sectors (303) of a cell (302). In this case, if the mobile user (301) travelled from sector 3 to sector 2, the sector switch would allow the base station (210) to follow the mobile user (301) from the odd to the even sector. This would also apply to a mobile user going from an even sector to an odd sector. The odd/even sector switch function may also be incorporated within the matrix switches (203).
Once the odd or even sector is selected, the signal is switched by the switch matrix (203). The switch matrix (203) routes the signal to the appropriate broadband antenna combiner (204) that is within the sector the switch matrix (203) controls. Both the switch matrix (203) and the sector switch (201) have the task of isolating one antenna (220) from another.
A broadband combiner (204) combines signals of different frequencies, from the switch matrices, to be transmitted on one antenna. The broadband combiner (204) output may feed a linear power amplifier (205). The input to the linear power amplifier will be signals of multiple frequencies that will generate intermodulation products if the amplifier is non-linear. Therefore, the linear power amplifier (205) must have a very linear amplification for proper operation of the cell site.
The linear power amplifiers is only required for normal cell site coverage in a metropolitan area. If the antenna switching system is used in a building or other situations where high power is not needed, the linear power amplifier can be removed and the antenna switching system will still operate properly.
A typical cell configuration uses a number of base stations for transmitting and receiving. A base station consists of a number of transmitters and receivers and typically has 8 to 18 frequencies for communication.
FIG. 4 illustrates a multiple base station configuration, the typical configuration of a cell. As in the single base station configuration, the signal from the base station (401) is transmitted to the appropriate switch matrix (402). The switch matrix (402) switches the signal to the broadband combiner (403) feeding the appropriate antenna (404). The broadband combiners (403) illustrated in FIG. 4 are shown having unconnected inputs (405). This denotes that this embodiment can be expanded with additional switch matrices without departing from the present invention.
FIG. 5 illustrates an alternate embodiment to interface the cavity combiner hardware presently used to the antenna switching system. Using this scheme, the cell will have some channels fixed in a sector and some reserved to accommodate changing traffic demands, thereby reducing the cost of upgrading a cell.
The antenna switching system allows dynamic frequency allocation in a cell. This is a result of the ability, to switch base station transmitters from sector to sector and because resonant cavity combiners are not needed. An overburdened sector in a cell can request a transmitter from another sector to assist in handling the traffic. The transmitters switched into the overburdened sector will be capable of transmitting on any frequency available in the system, thereby increasing the number of frequencies in that sector. If the system had control hardware/software to determine what frequency to assign to minimize interference between users, this invention would allow all the base stations in a cell to operate in one sector of the cell if needed.
Those skilled in the art will recognize that various modifications and changes could be made to the invention without departing from the spirit and scope thereof. It should therefore be understood that the claims are not to be considered as being limited to the precise embodiments set forth in the absence of specific limitations directed to each embodiments.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US2738464 *||Jul 9, 1951||Mar 13, 1956||Rca Corp||Voltage divider network|
|US4063243 *||May 27, 1975||Dec 13, 1977||The United States Of America As Represented By The Secretary Of The Navy||Conformal radar antenna|
|US4170759 *||May 2, 1977||Oct 9, 1979||Motorola, Inc.||Antenna sampling system|
|US4317229 *||Feb 25, 1980||Feb 23, 1982||Motorola, Inc.||Sectored antenna receiving system|
|US4412223 *||Jul 10, 1981||Oct 25, 1983||International Standard Electric Corporation||Antenna array with element isolation in the coupling network|
|US4485486 *||Feb 6, 1984||Nov 27, 1984||Motorola, Inc.||Method and apparatus for assigning duplex radio channels and scanning duplex radio channels assigned to mobile and portable radio telephones in a cellular radiotelephone communications system|
|US4549311 *||Mar 20, 1985||Oct 22, 1985||Motorola, Inc.||Method and apparatus for measuring the strength of a radio signal frequency|
|US4737978 *||Oct 31, 1986||Apr 12, 1988||Motorola, Inc.||Networked cellular radiotelephone systems|
|US4811032 *||Oct 16, 1987||Mar 7, 1989||Bbc Brown Boveri Ag||Method for monitoring and controlling an antenna selector and antenna selector for carrying out the method|
|JPS60223337A *||Title not available|
|JPS60226229A *||Title not available|
|1||"Matrix Assembly", Model SRF2230A, Motorola Inc., Publication No. 68P81053E29A, dated Sep. 30, 1988.|
|2||*||Matrix Assembly , Model SRF2230A, Motorola Inc., Publication No. 68P81053E29A, dated Sep. 30, 1988.|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US5666123 *||Jan 30, 1997||Sep 9, 1997||Northern Telecom Limited||Base station antenna arrangement|
|US5825814 *||Apr 19, 1996||Oct 20, 1998||Pinoak Digital Corporation||High speed, high and medium frequency communication system|
|US5854986 *||May 19, 1995||Dec 29, 1998||Northern Telecom Limited||Cellular communication system having device coupling distribution of antennas to plurality of transceivers|
|US6489843 *||Sep 12, 2001||Dec 3, 2002||Matsushita Electric Industrial Co., Ltd.||Power amplifier and communication unit|
|US6812905 *||Oct 31, 2001||Nov 2, 2004||Andrew Corporation||Integrated active antenna for multi-carrier applications|
|US6906681||Sep 27, 2002||Jun 14, 2005||Andrew Corporation||Multicarrier distributed active antenna|
|US6952586||Nov 29, 2000||Oct 4, 2005||Kmw Inc.||Frequency allocation system for use in a wireless communication system and method for the implementation thereof|
|US6983174||Sep 18, 2002||Jan 3, 2006||Andrew Corporation||Distributed active transmit and/or receive antenna|
|US7065383||Apr 16, 2002||Jun 20, 2006||Omri Hovers||Method and apparatus for synchronizing a smart antenna apparatus with a base station transceiver|
|US7280848||Sep 30, 2002||Oct 9, 2007||Andrew Corporation||Active array antenna and system for beamforming|
|US7289826||Apr 16, 2002||Oct 30, 2007||Faulkner Interstices, Llc||Method and apparatus for beam selection in a smart antenna system|
|US7346365||Apr 16, 2002||Mar 18, 2008||Faulkner Interstices Llc||Smart antenna system and method|
|US7349721||Aug 30, 2006||Mar 25, 2008||Faulkner Interstices, Llc||System and apparatus for collecting information for use in a smart antenna system|
|US7395094||Sep 22, 2005||Jul 1, 2008||Faulkner Interstices, Llc||Method and apparatus for synchronizing a smart antenna apparatus with a base station transceiver|
|US7418271||Aug 30, 2006||Aug 26, 2008||Faulkner Interstices Llc||Smart antenna apparatus|
|US7444157||Aug 30, 2006||Oct 28, 2008||Faulkner Interstices Llc||Method and apparatus for beam selection in a smart antenna system|
|US7463906||Aug 30, 2006||Dec 9, 2008||Faulkner Interstices Llc||Method and apparatus for collecting information for use in a smart antenna system|
|US7529525||Apr 16, 2002||May 5, 2009||Faulkner Interstices Llc||Method and apparatus for collecting information for use in a smart antenna system|
|US7555315||Jul 23, 2008||Jun 30, 2009||Omri Hovers||Smart antenna apparatus and method with automatic gain control|
|US7565174||Jul 21, 2009||Omri Hovers||Method and apparatus for monitoring and extracting information for use in a smart antenna system|
|US7801565||Sep 21, 2010||Omri Hovers||Method and apparatus for synchronizing a smart antenna apparatus with a base station transceiver|
|US7818012||Oct 19, 2010||Omri Hovers||Method and apparatus for processing random access bursts in a smart antenna system|
|US7826854||Sep 26, 2008||Nov 2, 2010||Omri Hovers||Method and apparatus for smart beam selection in a smart antenna system|
|US7904118||Sep 21, 2006||Mar 8, 2011||Omri Hovers||Method and apparatus for synchronizing a smart antenna apparatus with a base station transceiver|
|US7961668||Jun 14, 2011||Faulker Interstices LLC||Method and apparatus for synchronizing a smart antenna apparatus with a base station transceiver|
|US20020019235 *||Nov 29, 2000||Feb 14, 2002||Kmw Inc.||Frequency allocation system for use in a wireless communication system and method for the implementation thereof|
|US20030172560 *||May 4, 2001||Sep 18, 2003||Sanjurjo Ana Dominguez||Ear tag adaptable device for taking samples to identify cattle by means of dna|
|US20060030365 *||Sep 22, 2005||Feb 9, 2006||Omri Hovers||Method and apparatus for synchronizing a smart antenna apparatus with a base station transceiver|
|US20070054700 *||Aug 30, 2006||Mar 8, 2007||Omri Hovers||Method and apparatus for beam selection in a smart antenna system|
|US20070054701 *||Aug 30, 2006||Mar 8, 2007||Omri Hovers||Method and apparatus for collecting information for use in a smart antenna system|
|US20070093271 *||Aug 30, 2006||Apr 26, 2007||Omri Hovers||Smart antenna system and method|
|US20070093272 *||Aug 30, 2006||Apr 26, 2007||Omri Hovers||Method and apparatus for collecting information for use in a smart antenna system|
|US20070111760 *||Sep 21, 2006||May 17, 2007||Omri Hovers||Method and apparatus for synchronizing a smart antenna apparatus with a base station transceiver|
|US20070161406 *||Sep 21, 2006||Jul 12, 2007||Omri Hovers||Method and apparatus for synchronizing a smart antenna apparatus with a base station transceiver|
|US20080161056 *||Mar 3, 2008||Jul 3, 2008||Faulkner Interstices, Llc||Method and Apparatus for Monitoring Information For Use In A Smart Antenna System|
|EP1178692A1 *||Dec 7, 2000||Feb 6, 2002||KMW Inc.||Frequency allocation system for use in a wireless communication system and method for the implementation thereof|
|U.S. Classification||343/876, 455/277.1, 455/278.1|
|International Classification||H01Q3/24, H04W88/08|
|Cooperative Classification||H04W88/08, H01Q3/247|
|European Classification||H01Q3/24D, H04W88/08|
|Nov 18, 1998||FPAY||Fee payment|
Year of fee payment: 8
|Jan 13, 2003||FPAY||Fee payment|
Year of fee payment: 12
|Jan 13, 2003||SULP||Surcharge for late payment|
Year of fee payment: 11