US6101176A — Method and apparatus for operating an indoor CDMA…

Claim 1

Independent Claim 142 words

An indoor CDMA communication system operable within the coverage area of an outdoor communication system, the outdoor communication system using an uplink frequency band for uplinking signals and a downlink frequency band for downlinking signals, the indoor CDMA communication system comprising: at least one mobile station transceiver; an indoor base station transceiver operating transparently within the coverage area of the outdoor communication system, the indoor base station transceiver comprising: monitoring means for periodically monitoring the uplink frequency band and the downlink frequency band; means for determining a plurality of candidate frequencies on one of either the uplink frequency band or the downlink frequency band based upon a pre-determined acceptable interference level; means for selecting one candidate frequency from said plurality of candidate frequencies for use in bi-directional communication between said indoor base station transceiver and said at least one mobile station transceiver.

Claim 2

Dependent Claim 142 words

An indoor CDMA communication system operable within the coverage area of an outdoor communication system, the outdoor communication system using an uplink frequency band for uplinking signals and a downlink frequency band for downlinking signals, the indoor CDMA communication system comprising: at least one mobile station transceiver; an indoor base station transceiver operating transparently within the coverage area of the outdoor communication system, the indoor base station transceiver comprising: monitoring means for periodically monitoring the uplink frequency band and the downlink frequency band; means for determining a plurality of candidate frequencies on one of either the uplink frequency band or the downlink frequency band based upon a pre-determined acceptable interference level; means for selecting one candidate frequency from said plurality of candidate frequencies for use in bi-directional communication between said indoor base station transceiver and said at least one mobile station transceiver.

Claim 3

Dependent Claim 19 words

The indoor CDMA communication system of claim 1, wherein said bi-directional communication is a time division duplex (TDD) format.

Claim 4

Dependent Claim 111 words

The indoor CDMA communication system of claim 2, wherein said TDD format comprises: a transmit time slot wherein either said indoor base station transceiver or said at least one mobile station transceiver transmits information over said one candidate frequency; a receive time slot wherein either said indoor base station transceiver or said at least one mobile station transceiver receive information over said one candidate frequency; and a monitor time slot utilized by the monitoring means wherein neither said indoor base station transceiver nor said at least one mobile station transceiver transmit or receive information, and instead monitor the usage or interference dynamically changing interference levels on said plurality of candidate frequencies.

Claim 5

Dependent Claim 17 words

The indoor CDMA communication system of claim 1, wherein the outdoor communication system is a CDMA-based system.

Claim 6

Dependent Claim 25 words

The indoor CDMA communication system of claim 4, wherein the indoor CDMA communications system and the outdoor communication system operate according to an IS-95-based standard.

Claim 7

Dependent Claim 26 words

The indoor CDMA communication system of claim 4, wherein the indoor CDMA communications system and the outdoor communication system operate according to an ANSI J-STD-008 standard.

Claim 8

Dependent Claim 40 words

The indoor CDMA communication system of claim 1 further comprising means responsive to selection of said one candidate frequency for selecting a forward link component of said one candidate frequency, said forward link component falling within said downlink frequency band.

Claim 9

Dependent Claim 17 words

The indoor CDMA communication system of claim 1, wherein said plurality of candidate frequencies comprises low-use frequencies.

Claim 10

Dependent Claim 17 words

The indoor CDMA communication system of claim 1, wherein said plurality of candidate frequencies comprises non-interfering frequencies.

Claim 11

Dependent Claim 155 words

A communication system transparently operable within the coverage area of a second communication system, the second communication system using a first frequency band for uplinking signals and a second frequency band for downlinking signals, the communication system comprising: a base station transceiver within the coverage area of the second communication system, wherein the second communication system remains unaffected by the operation of the communication system; a mobile station transceiver for communicating with the base station transceiver; a monitoring means associated with the base station for monitoring the first frequency band and the second frequency band to determine a plurality of candidate spreading codes orthogonal to those used in the second communication system of one of either the first frequency band or the second frequency band; and a means for selecting one spreading code of said plurality of candidate spreading codes for use in the communication between said base station transceiver and said mobile station transceiver.

Claim 12

Dependent Claim 155 words

A communication system transparently operable within the coverage area of a second communication system, the second communication system using a first frequency band for uplinking signals and a second frequency band for downlinking signals, the communication system comprising: a base station transceiver within the coverage area of the second communication system, wherein the second communication system remains unaffected by the operation of the communication system; a mobile station transceiver for communicating with the base station transceiver; a monitoring means associated with the base station for monitoring the first frequency band and the second frequency band to determine a plurality of candidate spreading codes orthogonal to those used in the second communication system of one of either the first frequency band or the second frequency band; and a means for selecting one spreading code of said plurality of candidate spreading codes for use in the communication between said base station transceiver and said mobile station transceiver.

Claim 13

Independent Claim 188 words

A method of minimizing interference in a first communication system operable within the coverage area of a second communication system using a spreading code to identify a channel within a first frequency band for uplinking signals and a second frequency band for downlinking signals, said first communication system comprising a base station transceiver and a mobile station transceiver, the method comprising: (a) monitoring the first frequency band and the second frequency band by said base station transceiver to determine a plurality of candidate frequencies; (b) selecting one candidate frequency of said plurality of candidate frequencies for use in communication between said base station transceiver and said mobile station transceiver; (c) communicating information about said one candidate frequency from said base station transceiver to said mobile station transceiver; (d) communicating in a TDD format between said base station 16 transceiver and said mobile station transceiver using said one candidate frequency; and (e) repeating steps (a) through (d) during a periodic time frame to allow the second communication system to re-select the one candidate frequency in response to use of the selected one candidate frequency by the first communication system.

Claim 14

Independent Claim 188 words

A method of minimizing interference in a first communication system operable within the coverage area of a second communication system using a spreading code to identify a channel within a first frequency band for uplinking signals and a second frequency band for downlinking signals, said first communication system comprising a base station transceiver and a mobile station transceiver, the method comprising: (a) monitoring the first frequency band and the second frequency band by said base station transceiver to determine a plurality of candidate frequencies; (b) selecting one candidate frequency of said plurality of candidate frequencies for use in communication between said base station transceiver and said mobile station transceiver; (c) communicating information about said one candidate frequency from said base station transceiver to said mobile station transceiver; (d) communicating in a TDD format between said base station 16 transceiver and said mobile station transceiver using said one candidate frequency; and (e) repeating steps (a) through (d) during a periodic time frame to allow the second communication system to re-select the one candidate frequency in response to use of the selected one candidate frequency by the first communication system.

Claim 15

Dependent Claim 28 words

The method of claim 11, further comprising the step of selecting a forward link band of said one candidate frequency after the step of selecting one candidate frequency.

Claim 16

Dependent Claim 30 words

The method of claim 12, wherein the steps of communicating use the forward link band of said one candidate frequency, the forward link band falling within the second frequency band.

Claim 17

Dependent Claim 76 words

The method of claim 12, further comprising the steps of: measuring a first interference level within the forward link band; comparing the first interference level to a pre-determined threshold; and switching to a reverse link band of said one candidate frequency if the first interference level exceeds the pre-determined threshold so that the steps of communicating uses the reverse link band of said one candidate frequency, the reverse link band falling within the first frequency band.

Claim 18

Dependent Claim 14 words

The method of claim 11, wherein said plurality of candidate frequencies comprises low-use frequencies.

Claim 19

Dependent Claim 14 words

The method of claim 11, wherein said plurality of candidate frequencies comprises non-interfering frequencies.

Claim 20

Dependent Claim 48 words

The method of claim 11, further comprising: monitoring the first frequency band and the second frequency band by said mobile station transceiver to determine additional candidate frequencies; recording said additional candidate frequencies; and communicating said additional candidate frequencies from said mobile station transceiver to said base station transceiver.

Claim 21

Independent Claim 192 words

A method establishing a communication between a base station and a mobile station transceiver of a first communication system operating within a coverage area of a second communication system, the second communication system using a first frequency band for uplinking signals and a second frequency band for downlinking signals, the method comprising: monitoring the first frequency band and the second frequency band by said base station transceiver to determine a strongest interfering signal from the second communication system; identifying a first phase which the strongest interfering signal from the second communication system reaches said mobile station transceiver; identifying a second phase which a signal transmitted from said base station transceiver reaches said mobile station transceiver; calculating a phase error which indicates a difference between the first phase and the second phase; and adjusting a transmission timing of said base station transceiver to minimize any difference between said phase error and a predetermined optimal phase difference; and establishing communication between said base station transceiver and said mobile station transceiver by synchronizing the communication with the strongest interfering signal from the second communication system, wherein the base station transceiver utilizes the adjusted transmission timing.

Claim 22

Independent Claim 192 words

A method establishing a communication between a base station and a mobile station transceiver of a first communication system operating within a coverage area of a second communication system, the second communication system using a first frequency band for uplinking signals and a second frequency band for downlinking signals, the method comprising: monitoring the first frequency band and the second frequency band by said base station transceiver to determine a strongest interfering signal from the second communication system; identifying a first phase which the strongest interfering signal from the second communication system reaches said mobile station transceiver; identifying a second phase which a signal transmitted from said base station transceiver reaches said mobile station transceiver; calculating a phase error which indicates a difference between the first phase and the second phase; and adjusting a transmission timing of said base station transceiver to minimize any difference between said phase error and a predetermined optimal phase difference; and establishing communication between said base station transceiver and said mobile station transceiver by synchronizing the communication with the strongest interfering signal from the second communication system, wherein the base station transceiver utilizes the adjusted transmission timing.

Claim 23

Dependent Claim 33 words

The method of claim 18 wherein said optimal phase difference is 90 degrees so that said signal from said base station transceiver is orthogonal to a signal received from the second communication system.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	2003-08-08	2004-02-07	2004-08-08	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2007-08-08	2008-02-07	2008-08-08	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2011-08-08	2012-02-07	2012-08-08	$7700.00	Window Closed / Lapsed

Method and apparatus for operating an indoor CDMA telecommunications system

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