EP0511008A2
Expired / Lapsed
EP
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Wireless communication system
Assignee: Fujitsu Ltd
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Filing: 1992-04-24
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Granted: —
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Expires: 2012-04-24
Abstract
Abstract A wireless communication system containing at least one transmission apparatus (1, 2) and at least one communication terminal. The transmission apparatus (1, 2) transmits a wireless signal representing a bit sequence containing at least a predetermined number of bit errors, to the communication terminal. The communication terminal (41, ... 4n) receives the wireless signal to regenerate the bit sequence. The communication terminal (41, ... 4n) then examines the bit sequence represented by a received wireless signal to determine whether or not the number of bit errors contained in the bit sequence is equal to or greater than a predetermined number. When it is determined that at least the predetermined number of bit errors are contained in the bit sequence represented by a received wireless signal, the operation of the communication terminal is made inactive. Further, the transmission apparatus (1, 2) may transmit a wireless signal representing a bit sequence containing no pattern coinciding with a predetermined frame synchronization pattern, to the communication terminal (41, ... 4n). The communication terminal (41, ... 4n) receives the wireless signal to regenerate the bit sequence. The communication terminal then examines the bit sequence represented by a received wireless signal to determine whether or not the bit sequence contains the predetermined frame synchronization pattern. When it is determined that the bit sequence does not contain the predetermined frame synchronization pattern, the operation of the communication terminal is made inactive.
Inventors
- 👤 Toshihiro c/o Fujitsu Limited Yabe
- 👤 Norio Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 07:36
CPC Classifications
H; H04; H04W; H04W52/00; H04W52/02; H04W52/0209; H04W52/0225; H04W52/0238; H04W88/00; H04W88/02; H04W88/022; Y; Y02; Y02D; Y02D30/00; Y02D30/70
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
137 words
A process for making an operation of an apparatus (41) inactive, by remote control, comprising: a first step for transmitting a wireless signal representing a bit sequence containing at least a predetermined number of bit errors, to said apparatus (41); a second step for receiving said wireless signal by said apparatus (41); a third step for examining, in said apparatus (41), the a bit sequence represented by a received wireless signal to determine whether or not the number of bit errors contained in the bit sequence is equal to or greater than said predetermined number; and a fourth step for making the operation of the apparatus (41) inactive when it is determined in said third step that at least said predetermined number of bit errors are contained in said bit sequence represented by a received wireless signal.
Claim 2
Dependent Claim
177 words
A wireless communication system comprising: at least one wireless communication terminal (41, ... 4n); and at least one transmission apparatus (1, 2) for transmitting a wireless signal, to said at least one wireless communication terminal (41, ... 4n); said transmission apparatus (1, 2) comprises a turn-off signal transmission means for transmitting a turn-off signal representing a bit sequence containing at least a predetermined number of bit errors; each of said at least one wireless communication terminal (41, ... 4n) comprises, a receiving means (51, 52) for receiving a wireless signal, and regenerating a bit sequence represented by the received wireless signal, an examining means for examining the bit sequence represented by the received wireless signal to determine whether or not the number of bit errors contained in the bit sequence is equal to or more than a predetermined number, and a turn-off control means for making the operation of the wireless communication terminal (41, ... 4n) inactive when said examining means determines that at least said predetermined number of bit errors is contained in the bit sequence.
Claim 3
Dependent Claim
111 words
A wireless communication system according to claim 2, wherein said bit sequence represented by said turn-off signal contains no pattern coinciding with said frame synchronization pattern; each of said at least one wireless communication terminal (41, ... 4n) further comprises a frame synchronization pattern detection means for trying to detect the frame synchronization pattern in the bit sequence represented by the received signal; and said turn-off control means in each wireless communication terminal (41, ... 4n) makes the operation of the wireless communication terminal (41, ... 4n) inactive when the frame synchronization pattern detection means fails to detect the frame synchronization pattern in the bit sequence represented by the received signal.
Claim 4
Dependent Claim
38 words
A wireless transmission apparatus for transmitting a wireless signal representing a first bit sequence, comprising a turn-off signal transmission means for transmitting a turn-off signal representing a bit sequence containing at least a predetermined number of bit errors.
Claim 5
Dependent Claim
47 words
A wireless transmission apparatus according to claim 4, wherein said bit sequence is formatted in a frame, further contains a frame synchronization pattern for indicating a reference frame phase, and the bit sequence represented by said turn-off signal contains no pattern coinciding with said frame synchronization pattern.
Claim 6
Dependent Claim
102 words
A wireless communication terminal comprising: a receiving means (51, 52) for receiving a wireless signal, and regenerating a bit sequence represented by the received wireless signal; an examining means for examining the bit sequence represented by the received wireless signal to determine whether or not the number of bit errors contained in the bit sequence is equal to or mote than a predetermined number; and a turn-off control means for making the operation of the wireless communication terminal (41, ... 4n) inactive when said examining means determines that at least said predetermined number of bit errors is contained in the bit sequence.
Claim 7
Dependent Claim
116 words
A wireless communication terminal according to claim 6, wherein said bit sequence is formatted in a frame, further contains a frame synchronization pattern for indicating a reference frame phase, and said bit sequence represented by the turn-off signal contains no pattern coinciding with said frame synchronization pattern; said wireless communication terminal (41, --4n) further comprises a frame synchronization pattern detection means for trying to detect the frame synchronization pattern in the received signal; and said turn-off control means in each wireless communication terminal (41, ... 4n) makes the operation of said wireless communication terminal (41, ... 4n) inactive when the frame synchronization pattern detection means fails to detect the frame synchronization pattern in the received signal.
Claim 8
Dependent Claim
112 words
A process for making an operation of an apparatus (41) inactive, by remote control, comprising: a first step for transmitting a wireless signal representing a bit sequence containing no pattern coinciding with said frame synchronization pattern, to said apparatus (41); a second step for receiving said wireless signal by said apparatus (41); a third step for trying, in said apparatus (41), to detect the frame synchronization pattern in the bit sequence represented by the received signal; and a fourth step for making the operation of the apparatus (41) inactive when the frame synchronization pattern detection means fails to detect the frame synchronization pattern in the bit sequence represented by the received signal.
Claim 9
Dependent Claim
167 words
A wireless communication system comprising: at least one wireless communication terminal (41, ... 4n); and at least one transmission apparatus (1, 2) for transmitting a wireless signal, to said at least one wireless communication terminal (41, ... 4n); said transmission apparatus (1, 2) comprises a turn-off signal transmission means for transmitting a turn-off signal representing a bit sequence containing no pattern coinciding with a predetermined frame synchronization pattern; each of said at least one wireless communication terminal (41, ... 4n) comprises, a receiving means (51, 52) for receiving a wireless signal, and regenerating a bit sequence represented by the received wireless signal, a frame synchronization pattern detection means for trying to detect said predetermined frame synchronization pattern in the bit sequence represented by the received signal, and a turn-off control means for making the operation of the wireless communication terminal (41, ... 4n) inactive when the frame synchronization pattern detection means fails to detect the frame synchronization pattern in the bit sequence represented by the received signal.
Claim 10
Dependent Claim
91 words
A wireless communication terminal comprising: a receiving means (51, 52) for receiving a wireless signal, and regenerating a bit sequence represented by the received wireless signal, a frame synchronization pattern detection means for trying to detect a predetermined frame synchronization pattern in the bit sequence represented by the received signal, and a turn-off control means for making the operation of the wireless communication terminal (41, ... 4n) inactive when the frame synchronization pattern detection means fails to detect the frame synchronization pattern in the bit sequence represented by the received signal.
Claim 11
Dependent Claim
291 words
A wireless paging system comprising: a plurality of pager terminals (41, ... 4n); and at least one transmission apparatus (1, 2) for transmitting a wireless signal to the plurality of pager terminals (41, ... 4n); said transmission apparatus (1, 2) comprises, a first signal transmission means (14) for transmitting a first wireless signal representing a first bit sequence, where said first bit sequence contains a bit error correction code based on a predetermined rule for bit error detection and correction so that, in accordance with the predetermined rule, at least one bit error contained in the bit sequence represented by the first wireless signal can be detected, and, when the number of the detected bit error is less than a predetermined number, the detected bit error can be corrected, and a second signal transmission means (15) for transmitting, following an end of the transmission of said first wireless signal, a second wireless signal representing a second bit sequence containing at least said predetermined number of bit errors; each of said plurality of pager terminals (41, ... 4n) comprises, a receiving means (51, 52) for receiving the first and second wireless signals, and regenerating the first and second bit sequences represented by the received first and second wireless signal, an examining means for examining the first and second bit sequences represented by the received first and second wireless signals to detect a bit error contained in the first and second bit sequences, assuming that the first and second bit sequences contain a bit error correction code based on said predetermined rule, and a sleep mode control means for making the operation of the pager terminal (41, ... 4n) inactive when said examining means detects at least said predetermined number of bit errors.
Claim 12
Dependent Claim
48 words
A wireless paging system according to claim 11, wherein each of said pager terminals (41, ... 4n) further comprising an intermittent watching means for intermittently making the operation of the pager terminal (41, ... 4n) active while the pager terminal (41, ... 4n) is in the inactive state.
Claim 13
Dependent Claim
137 words
A wireless paging system according to claim 11, wherein said first bit sequence is formatted in a frame, further contains a frame synchronization pattern for indicating a reference frame phase, and said second bit sequence contains no pattern coinciding with said frame synchronization pattern; each of said plurality of pager terminals (41, ... 4n) further comprises a frame synchronization pattern detection means for trying to detect the frame synchronization pattern in the first and second bit sequences represented by the received wireless first and second wireless signals; and said sleep mode control means in each pager terminal (41, ... 4n) makes the operation of the pager terminal (41, ... 4n) inactive when the frame synchronization pattern detection means fails to detect the frame synchronization pattern in the second bit sequence represented by the received second wireless signal.
Claim 14
Dependent Claim
136 words
A wireless transmission apparatus for transmitting a wireless signal, comprising: a first signal transmission means (14) for transmitting a first signal representing a first bit sequence, where said first bit sequence contains a bit error correction code based on a predetermined rule for bit error detection and correction so that, in accordance with the predetermined rule, at least one bit error contained in the first bit sequence represented by the first wireless signal can be detected, and, when the number of the detected bit error is less than a predetermined number, the detected bit error can be corrected; and a second signal transmission means (15) for transmitting, following an end of the transmission of the first wireless signal, a second wireless signal representing a second bit sequence containing at least said predetermined number of bit errors.
Claim 15
Dependent Claim
44 words
A wireless transmission apparatus according to claim 14, wherein said first bit sequence is formatted in a frame, further contains a frame synchronization pattern for indicating a reference frame phase, and said second bit sequence contains no pattern coinciding with said frame synchronization pattern.
Claim 16
Dependent Claim
191 words
A pager terminal comprising: a receiving means (51, 52) for receiving a wireless signal, and regenerating first and second bit sequences represented by the received wireless signal; an examining means for examining the first and second bit sequences represented by the received wireless signals to detect a bit error contained in the first and second bit sequences, assuming that the received first and second bit sequences contain a bit error correction code based on a predetermined rule; and a sleep mode control means for making the operation of said pager terminal (41, ... 4n) inactive when said examining means detects at least a predetermined number of bit errors; said first bit sequence represents a paging signal for paging said pager terminal (41, ... 4n), and contains a bit error correction code based on said predetermined rule; in accordance with said predetermined rule, at least one bit error contained in a bit sequence can be detected, and, when the number of the detected bit error is less than said predetermined number, the detected bit error can be corrected; and said second bit sequence contains at least said predetermined number of bit errors.
Claim 17
Dependent Claim
38 words
A pager terminal according to claim 16, further comprising an intermittent watching means for intermittently making the operation of the pager terminal (41, ... 4n) active while the pager terminal (41, ... 4n) is in the inactive state.
Claim 18
Dependent Claim
118 words
A pager terminal according to claim 16, wherein said first bit sequence is formatted in a frame, further contains a frame synchronization pattern for indicating a reference frame phase, and said second bit sequence contains no pattern coinciding with said frame-synchronization pattern; said pager terminal (41, ... 4n) further comprises a frame synchronization pattern detection means for trying to detect the frame synchronization pattern in the first and second bit sequences represented by the received signal; and said sleep mode control means in each pager terminal (41, ... 4n) makes the operation of said pager terminal (41, ... 4n) inactive when the frame synchronization pattern detection means fails to detect the frame synchronization pattern in the received signal.
References Cited (Backward Citations)
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