EP0218450A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Control system of a radio telephone apparatus
Assignee: Toshiba Corp
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Filing: 1986-09-30
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Granted: —
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Expires: 2006-09-30
Abstract
Abstract Where a carrier wave is received from a called radio telephone set (2) and where the identification signal of the radio telephone set (2) coincides with a preassigned identification signal, transmission of a paging signal from a base unit (1) is stopped. Even when the identification signals do not coincide with each other, the paging signal is sent continuously over a definite interval.
Inventors
- 👤 Kazuhiro Yoshizawa
- 👤 Akio C/O Nec Coporation Yotsutani
- 👤 Noboru C/O Nec Corporation Saegusa
- 👤 Koichi Ito
- 👤 Syozi Huse
- 👤 Akio Toki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 03:28
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/72; H04M1/725; H04M1/72502; H04M1/72505; H04M1/72508
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
268 words
A control system for a radio telephone apparatus comprising a base unit (1) having a radio transmitter (5) and a radio receiver (8) and connected to a wired telephone line (3), a radio telephone set (2) having a radio transmitter (17) and a radio receiver (14) and connected to said base unit (1) through a radio channel, and call signal detecting means (13) for detecting a call signal from said wired telephone line (3), characterized in that there are provided: paging signal transmitting means (5, 9) for transmitting a paging signal from said base unit (1) to said radio telephone set (2) in response to an output of said call signal detecting means (13); paging response signal transmitting means (17) for transmitting a paging response signal containing an identification signal (1D) from said radio telephone set (2) to said base unit (1) in response to said paging signal; received field detecting means (10) for detecting at said base unit (1) an electric field of said paging response signal transmitted from said radio telephone set (2), identification signal detecting means (11) for detecting coincidence between an identification signal (ID) contained in said paging response signal and a preregistered identification signal; and control means (12) for terminating transmission of said paging signal when both output of said received field detecting means (10) and output of said identification signal detecting means (11) are present, and for causing transmission of said paging signal to continue when either one or both of the output of said received field detecting means (10) and the output of said identification signal detecting means is not present.
Claim 2
Dependent Claim
268 words
A control system for a radio telephone apparatus comprising a base unit (1) having a radio transmitter (5) and a radio receiver (8) and connected to a wired telephone line (3), a radio telephone set (2) having a radio transmitter (17) and a radio receiver (14) and connected to said base unit (1) through a radio channel, and call signal detecting means (13) for detecting a call signal from said wired telephone line (3), characterized in that there are provided: paging signal transmitting means (5, 9) for transmitting a paging signal from said base unit (1) to said radio telephone set (2) in response to an output of said call signal detecting means (13); paging response signal transmitting means (17) for transmitting a paging response signal containing an identification signal (1D) from said radio telephone set (2) to said base unit (1) in response to said paging signal; received field detecting means (10) for detecting at said base unit (1) an electric field of said paging response signal transmitted from said radio telephone set (2), identification signal detecting means (11) for detecting coincidence between an identification signal (ID) contained in said paging response signal and a preregistered identification signal; and control means (12) for terminating transmission of said paging signal when both output of said received field detecting means (10) and output of said identification signal detecting means (11) are present, and for causing transmission of said paging signal to continue when either one or both of the output of said received field detecting means (10) and the output of said identification signal detecting means is not present.
Claim 3
Dependent Claim
38 words
A control system as set forth in claim 1 wherein said radio telephone set (2) performs an intermittent receiving operation by repeatedly making its radio receiver (14) operative for a period and then inoperative for another given period.
Claim 4
Dependent Claim
37 words
A control system as set forth in claim 2 wherein said paging signal transmitting means (5, 9) transmits the paging signal, a plurality of times when output of said received field detecting means (11) is not produced.
Claim 5
Dependent Claim
56 words
A control system as set forth in claim 3 wherein the number of times m that said paging signal transmitting means (5, 9) transmits the paging signal is determined by the following formula; where a : length of the paging signal, T : operative period for the receiver, T 2 : inoperative period for the receiver.
Claim 6
Dependent Claim
19 words
A control system as set forth in claim 1 wherein said identification signal (ID) comprises a digital code signal.
Claim 7
Dependent Claim
19 words
A control system as set forth in claim 1 wherein said identification signal (ID) comprises an analog tone signal.
Claim 8
Dependent Claim
37 words
A control system as set forth in claim 1 wherein said paging response signal is transmitted through a predetermined control channel, and said received field detecting means (10) detects the received electric field at said control channel.
Claim 9
Dependent Claim
67 words
A control system as set forth in claim 1 wherein said control means (12) comprises means for stopping the transmission of said paging signal in response to the output of said received field detecting means (10), and means for transmitting again said paging signal when output of said identification signal detecting means (11) is not produced and output of said call signal detecting circuit (13) is produced.
Claim 10
Dependent Claim
78 words
A control system as set forth in claim 1 wherein said control means (12) comprises means for stopping the transmission of said paging signal in response to the output of said received field detecting means (10), and means for transmitting again said paging signal when output of said identification signal detecting means (11) is not produced, output of said call signal detecting circuit (13) is produced and output of said received field detecting means (10) is not produced.
Claim 11
Dependent Claim
77 words
A control system as set forth in claim 1 wherein said control means (12) comprises means for stopping the transmission of said paging signal when output of said received field detecting means (10) and output of said identification signal detecting means (11) are produced, and means for continuing the transmission of said paging signal when output of said received field detecting means (10) is produced and output of said identification signal detecting means (11) is not produced.
References Cited (Backward Citations)
No citation records indexed.
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