US5491718A — CDMA radiotelephone having optimized slotted mode…

Claim 1

Independent Claim 90 words

For use in a radiotelephone system, a method of operating a radiotelephone in a discontinuous reception mode, comprising the steps of: periodically activating at least a portion of a radiotelephone to receive a transmission, wherein a time period between periodic activations of the radiotelephone is predetermined to be a function of an integer multiple of a radiotelephone system time constant and also an integer multiple of a smallest partition of a transmission period; and receiving at least a portion of the transmission during a period subsequent to each periodic activation.

Claim 2

Dependent Claim 90 words

For use in a radiotelephone system, a method of operating a radiotelephone in a discontinuous reception mode, comprising the steps of: periodically activating at least a portion of a radiotelephone to receive a transmission, wherein a time period between periodic activations of the radiotelephone is predetermined to be a function of an integer multiple of a radiotelephone system time constant and also an integer multiple of a smallest partition of a transmission period; and receiving at least a portion of the transmission during a period subsequent to each periodic activation.

Claim 3

Dependent Claim 82 words

For use in a radiotelephone system, a method of operating a radiotelephone in a discontinuous reception mode, comprising the steps of: periodically activating at least a portion of a radiotelephone to receive a transmission during a transmission period, wherein the transmission period is predetermined to be a first integer multiple of a radiotelephone system time constant and also a second integer multiple of a partition of the transmission period; and receiving the transmission during at least a portion of the transmission period.

Claim 4

Dependent Claim 82 words

For use in a radiotelephone system, a method of operating a radiotelephone in a discontinuous reception mode, comprising the steps of: periodically activating at least a portion of a radiotelephone to receive a transmission during a transmission period, wherein the transmission period is predetermined to be a first integer multiple of a radiotelephone system time constant and also a second integer multiple of a partition of the transmission period; and receiving the transmission during at least a portion of the transmission period.

Claim 5

Dependent Claim 37 words

A method as set forth in claim 2 wherein the system time constant is a pseudonoise (PN) generator rollover period, and wherein the partition of a transmission period is a frame period within a paging channel slot.

Claim 6

Dependent Claim 23 words

A method as set forth in claim 3 wherein the first integer multiple is 3, and wherein the second integer multiple is 4.

Claim 7

Dependent Claim 104 words

A radiotelephone, comprising: a receiver for receiving a wireless transmission; means for periodically activating at least said receiver to receive the wireless transmission during an assigned transmission period for operating said radiotelephone in a discontinuous reception mode, wherein the assigned transmission period is predetermined to have a duration that is a first integer multiple of a radiotelephone system time constant and also a second integer multiple of a partition of the assigned transmission period; and means, having an input coupled to an output of said receiver, for demodulating the wireless transmission that is received during at least a portion of the assigned transmission period.

Claim 8

Dependent Claim 104 words

A radiotelephone, comprising: a receiver for receiving a wireless transmission; means for periodically activating at least said receiver to receive the wireless transmission during an assigned transmission period for operating said radiotelephone in a discontinuous reception mode, wherein the assigned transmission period is predetermined to have a duration that is a first integer multiple of a radiotelephone system time constant and also a second integer multiple of a partition of the assigned transmission period; and means, having an input coupled to an output of said receiver, for demodulating the wireless transmission that is received during at least a portion of the assigned transmission period.

Claim 9

Dependent Claim 39 words

A radiotelephone as set forth in claim 5, wherein said system time constant is a pseudonoise (PN) generator rollover period, and wherein the partition of the assigned transmission period is a frame within a slot of a paging channel.

Claim 10

Dependent Claim 23 words

A radiotelephone as set forth in claim 6, wherein the first integer multiple is 3, and wherein the second integer multiple is 4.

Claim 11

Dependent Claim 128 words

A radiotelephone including a control mechanism for operating said radiotelephone in a discontinuous reception mode within a Code Division Multiple Access (CDMA) radiotelephone system, comprising: a receiver for receiving a CDMA transmission; a system time pseudonoise (PN) generator means; means for periodically activating at least said receiver to receive the CDMA transmission during an assigned slot of a paging channel, wherein the assigned slot is comprised of a plurality of frames and is predetermined to have a duration that is three times the duration of a rollover period of said system time pseudonoise (PN) generator means and four times the duration of one frame; and means, having an input coupled to said receiver, for despreading the CDMA transmission received during at least a portion of the assigned slot.

Claim 12

Dependent Claim 128 words

A radiotelephone including a control mechanism for operating said radiotelephone in a discontinuous reception mode within a Code Division Multiple Access (CDMA) radiotelephone system, comprising: a receiver for receiving a CDMA transmission; a system time pseudonoise (PN) generator means; means for periodically activating at least said receiver to receive the CDMA transmission during an assigned slot of a paging channel, wherein the assigned slot is comprised of a plurality of frames and is predetermined to have a duration that is three times the duration of a rollover period of said system time pseudonoise (PN) generator means and four times the duration of one frame; and means, having an input coupled to said receiver, for despreading the CDMA transmission received during at least a portion of the assigned slot.

Claim 13

Dependent Claim 128 words

A Code Division Multiple Access (CDMA) radiotelephone system, comprising: at least one base station for transmitting a paging channel having a plurality of repeating paging channel slots each of which is comprised four frames; a radiotelephone comprising circuit means and control means for operating said radiotelephone within the CDMA radiotelephone system, said radiotelephone comprising, a receiver for receiving the paging channel transmission; a system time pseudonoise (PN) generator means; means, having an input coupled to said receiver, for despreading the paging channel transmission received during at least a portion of the assigned slot, wherein the assigned slot is predetermined to have a duration that is three times the duration of a rollover period of said system time pseudonoise (PN) generator and four times the duration of one frame.

Claim 14

Dependent Claim 128 words

A Code Division Multiple Access (CDMA) radiotelephone system, comprising: at least one base station for transmitting a paging channel having a plurality of repeating paging channel slots each of which is comprised four frames; a radiotelephone comprising circuit means and control means for operating said radiotelephone within the CDMA radiotelephone system, said radiotelephone comprising, a receiver for receiving the paging channel transmission; a system time pseudonoise (PN) generator means; means, having an input coupled to said receiver, for despreading the paging channel transmission received during at least a portion of the assigned slot, wherein the assigned slot is predetermined to have a duration that is three times the duration of a rollover period of said system time pseudonoise (PN) generator and four times the duration of one frame.

Claim 15

Independent Claim 109 words

A method for use in a CDMA radiotelephone for initializing a Long Code pseudonoise (PN) generator, comprising the steps of: determining a multi-bit mask that, when Exclusive-ORed with a current state of a Long Code PN generator, produces a state that the Long Code PN generator is known to assume at a predetermined future time; storing the mask in a memory of the radiotelephone; and in response to a requirement to initialize the Long Code PN generator at the predetermined future time, accessing the memory to retrieve the mask; and Exclusive-ORing the retrieved mask with a previous state of the Long Code PN generator to obtain a correct state.

Claim 16

Independent Claim 109 words

A method for use in a CDMA radiotelephone for initializing a Long Code pseudonoise (PN) generator, comprising the steps of: determining a multi-bit mask that, when Exclusive-ORed with a current state of a Long Code PN generator, produces a state that the Long Code PN generator is known to assume at a predetermined future time; storing the mask in a memory of the radiotelephone; and in response to a requirement to initialize the Long Code PN generator at the predetermined future time, accessing the memory to retrieve the mask; and Exclusive-ORing the retrieved mask with a previous state of the Long Code PN generator to obtain a correct state.

Claim 17

Dependent Claim 91 words

A CDMA radiotelephone that includes a pseudonoise (PN) generator, comprising: memory means for storing a multi-bit mask that, when Exclusive-ORed with a current state of said PN generator, produces a state that said PN generator is known to assume at a predetermined future time; means, responsive to a requirement to initialize said PN generator at the predetermined future time, for accessing said memory means to retrieve the stored multi-bit mask; and means for Exclusive-ORing the retrieved multi-bit mask with a previous state of said PN generator to obtain a correct state.

Claim 18

Dependent Claim 91 words

A CDMA radiotelephone that includes a pseudonoise (PN) generator, comprising: memory means for storing a multi-bit mask that, when Exclusive-ORed with a current state of said PN generator, produces a state that said PN generator is known to assume at a predetermined future time; means, responsive to a requirement to initialize said PN generator at the predetermined future time, for accessing said memory means to retrieve the stored multi-bit mask; and means for Exclusive-ORing the retrieved multi-bit mask with a previous state of said PN generator to obtain a correct state.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1999-02-12	1999-08-14	2000-02-13	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2003-02-12	2003-08-14	2004-02-13	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2007-02-12	2007-08-14	2008-02-13	$7700.00	Window Closed / Lapsed

CDMA radiotelephone having optimized slotted mode and long code operation

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