System for maintaining receiver/transmitter synchronization with two-way pagers
First Claim
1. A two-way paging system, comprising:
- (a) a transmitter for generating frames having pages the transmitter including first timing means;
(b) a plurality of personal paging units that receive pages from the transmitter, and which generate response signals at predetermined time periods specified in the frames;
(c) a receiver having first and second receiving circuitry, the first receiving circuitry receiving radio signals from the personal paging units, and the second receiving circuitry receiving radio signals from a source other than the personal paging units, the receiver also including second timing means distinct from the first timing means; and
(d) first data processing means, electronically linked with the first and second receiving circuitry in the receiver, for identifying the radio signals and their source by determining the time periods during which the radio signals are received from the personal paging units by the first receiving circuitry, based on radio signals received from the other source by the second receiving circuitry the first data processing means configurable to synchronize the second timing means with the first timing means.
1 Assignment
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Accused Products
Abstract
A two-way paging system (10) includes a plurality of personal paging units (16). The personal paging units (16) receive pages (18), and generate radio signals (28) in response to the pages. The system includes a transmitter (12) for generating the pages, and a receiver (14). The receiver includes first and second receiving circuitry (30) and (34). The first receiving circuitry receives radio signals from the personal paging units. The second receiving circuitry receives radio signals from a source other than the personal paging units. The receiver further includes a data processor (32) electronically linked with the first and second receiving circuitry in the receiver. The data processor determines the time period during which radio signals are received from the personal paging units by the first receiving circuitry, based on radio signals received from the other source by the second receiving circuitry. In a preferred embodiment, the second receiving circuitry receives radio signals from the transmitter.
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Citations
22 Claims
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1. A two-way paging system, comprising:
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(a) a transmitter for generating frames having pages the transmitter including first timing means; (b) a plurality of personal paging units that receive pages from the transmitter, and which generate response signals at predetermined time periods specified in the frames; (c) a receiver having first and second receiving circuitry, the first receiving circuitry receiving radio signals from the personal paging units, and the second receiving circuitry receiving radio signals from a source other than the personal paging units, the receiver also including second timing means distinct from the first timing means; and (d) first data processing means, electronically linked with the first and second receiving circuitry in the receiver, for identifying the radio signals and their source by determining the time periods during which the radio signals are received from the personal paging units by the first receiving circuitry, based on radio signals received from the other source by the second receiving circuitry the first data processing means configurable to synchronize the second timing means with the first timing means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A two-way paging system, comprising:
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(a) a plurality of personal paging units, each of the personal paging units including; (i) receiving circuitry for receiving paging radio signals in the form of frames, each frame including a plurality of pages, wherein at least some of the pages specify a time period for responding, and identify one of the personal paging units that the page is directed to; (ii) transmitting circuitry for generating responsive radio signals; and (iii) personal paging unit data processing means electronically linked to the receiving and transmitting circuitry for determining whether a page identifies the personal paging unit, the time period specified in a page identifying the personal paging unit, and causing the transmitting circuitry to generate radio signals during the time period specified in a page identifying the personal paging unit receiving the page, wherein a selected one of the personal paging units generates a responsive radio signal in response to each frame received; (b) a transmitter for generating frames, each frame including a plurality of pages;
the transmitter having first timing means;(c) a receiver for receiving radio signals from the personal paging units the receiver having second timing means distinct from the first timing means; (d) transmitter data processing means electronically linked to the transmitter, the transmitter data processing means causing the transmitter to repeatedly generate the frames; and (e) receiver data processing means electronically linked to the receiver for identifying the radio signals and their source be determining the time periods the radio signals are received from the personal paging units, based on responsive radio signals received from the selected one personal paging unit the receiver data processing means configurable to synchronize the second timing means with the first timing means. - View Dependent Claims (15, 16)
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17. A method for synchronizing a receiver with a transmitter in a paging system having two-way personal paging units, comprising the steps of:
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(a) causing the transmitter to generate frames having pages, wherein each frame includes a synchronization portion having information indicative of the time each frame was generated, and wherein each page specifies a time period for responding to the page; (b) receiving radio signals from the personal paging units with first receiving circuitry associated with the receiver at predetermined time periods; (c) receiving radio signals from a source other than the personal paging units with second receiving circuitry associated with the receiver; and (d) identifying the radio signals and their source by determining the time periods during which radio signals are received from the personal paging units by the first receiving circuitry, based on radio signals received from the other source by the second receiving circuitry. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification