Code division multiplexed acknowledge back paging system
First Claim
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1. An acknowledge back pager having a unique address associated therewith, said pager comprising;
- receiving means for receiving paging signals from a central station, said paging signals including a batch of M pager addresses transmitted in a sequential order during a first time period, wherein M is the number of pager addresses in said batch;
decoding means, coupled to said receiving means, for detecting the presence of said pager'"'"'s address within said batch of M addresses;
address order determining means, coupled to said decoding means, for determining the order of said pager'"'"'s address within said batch of M addresses, andpseudorandom code transmitting means for transmitting an acknowledge back signal at a selected frequency, said acknowledge back signal including a selected one of a plurality of M substantially orthogonal pseudorandom codes, said selected one of said codes exhibiting a predetermined relationship to the order of the address of said pager within said batch of M addresses.
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Abstract
An acknowledge back (ack-back) paging system is provided which includes a central station which transmits a group of message signals to an group of ack-back pagers which are addressed as a group. The users of the group of addressed ack-back pagers indicate a response to their respective pagers thus providing ack-back data. The pagers in the group of addressed ack-back pagers then simultaneously transmit back to the central station their ack-back signals using different respective pseudorandom codes, a different pseudorandom code being dynamically allocated to each of the pagers in the group.
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Citations
21 Claims
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1. An acknowledge back pager having a unique address associated therewith, said pager comprising;
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receiving means for receiving paging signals from a central station, said paging signals including a batch of M pager addresses transmitted in a sequential order during a first time period, wherein M is the number of pager addresses in said batch; decoding means, coupled to said receiving means, for detecting the presence of said pager'"'"'s address within said batch of M addresses; address order determining means, coupled to said decoding means, for determining the order of said pager'"'"'s address within said batch of M addresses, and pseudorandom code transmitting means for transmitting an acknowledge back signal at a selected frequency, said acknowledge back signal including a selected one of a plurality of M substantially orthogonal pseudorandom codes, said selected one of said codes exhibiting a predetermined relationship to the order of the address of said pager within said batch of M addresses. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An acknowledge back pager having a unique address associated therewith, said pager comprising;
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receiving means for receiving paging signals from a central station, said paging signals including a batch of M pager addresses transmitted in a sequential order during a first time period, wherein M is the number of pager addresses in said batch; memory means for storing a look-up table of M pseudorandom codes including pseudorandom code 1, pseudorandom code 2, . . . pseudorandom code M; transmitting means for transmitting acknowledge back signals at a selected frequency employing a selected one of said M pseudorandom codes; microcomputer means, coupled to said receiving means and said memory means, for processing paging signals received by said pager, said microcomputer means including decoding means for detecting the presence of said pager'"'"'s address within said batch of M addresses; address order determining means for determining the order of said pager'"'"'s address within said batch of M addresses, and pseudorandom code control means, coupled to said transmitting means, for generating an acknowledge back signal coded with a selected one of said plurality of M predetermined pseudorandom codes, said selected one of said pseudorandom codes exhibiting a predetermined relationship to the order of the address of said pager within said batch of M addresses. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. In a radio paging system including a central paging terminal for transmitting address and message signals to a plurality of remotely located radio pagers, each pager having an address corresponding thereto, a method of radio paging comprising the steps of:
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A. sequentially transmitting a batch of M pager addresses during a first time period, wherein M is the number of pager addresses in said batch; and B. the batch of pagers addressed in step A transmitting respective acknowledge back signals simultaneously in a second timer period subsequent to said first time period, each of said batch of pagers transmitting a different pseudorandom code which is assigned to each respective pager based on a predetermined relationship to the order in which said batch of M addresses were transmitted by said central paging terminal. - View Dependent Claims (16, 17, 18)
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19. In a radio paging system including a central paging terminal for transmitting address and message signals to a plurality of remotely located radio pagers, each pager having an address corresponding thereto, a method of radio paging comprising the steps of:
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A. sequentially transmitting a batch of M pager addresses during a first time period, wherein M is the number of pager addresses in said batch; B. providing an alert to indicate to a user of an addressed one of said M pages that said pager has been addressed; C. indicating respective responses to said M addressed pagers; and D. the batch of pagers addressed in step A transmitting respective acknowledge back signals indicative of the respective responses provided thereto, such acknowledge back signals being transmitted simultaneously in a second time period subsquent to said first time period, each of said batch of pagers transmitting acknowledge back signals with a different one of M pseudorandom codes which is assigned to each respective pager based on a predetermined relationship to the order in which said batch of M addresses were transmitted by said central paging terminal.
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20. In a radio paging system including a central paging terminal for transmitting address and message signals to a plurality of remotely located radio pagers, each pager having an address corresponding thereto, a method of radio paging comprising the steps of:
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A. sequentially transmitting a batch of M pager addresses during a first time period, wherein M is the number of pager addresses in said batch; B. dynamically assigning a different pseudorandom code to each pager of the batch of pagers addressed in step A; and C. simultaneously transmitting from selected pagers of said batch of pagers respective acknowledge back signals in a second time period subsequent to said first time period, each acknowledge back signal including the correspondingly assigned pseudorandom code of its transmitting pager.
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21. In a radio paging system including a central paging terminal for transmitting address and message signals to a plurality of remotely located radio pagers, each pager having an address corresponding thereto, a method of radio paging comprising the steps of:
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A. sequentially transmitting a batch of M pager addresses during a first time period, wherein M is the number of pager addresses in said batch; B. providing an alert to indicate to a user of an addressed one of said M pagers that pager has been addressed; C. indicating respective responses to pagers of said M addressed pagers; D. dynamically assigning a different pseudorandom code to each pager of the batch of pagers addressed in step A; and E. transmitting from said pagers acknowledge back signals indicative of the respective responses provided thereto, such acknowledge back signals being transmitted simultaneously in a second time period subsequent to said first time period, each acknowledge back signal including the assigned pseudorandom code of its respective transmitting pager.
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Specification