Wireless communication system compulsively turning remote terminals into inactive state

• US 6,078,631 A
• Filed: 04/27/1992
• Issued: 06/20/2000
• Est. Priority Date: 04/26/1991
• Status: Expired due to Fees

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Sasaki, Norio, Yabe, Toshihiro
• Primary Examiner(s): Chin, Stephen
• Assistant Examiner(s): WEBSTER, BRYAN E
• Application Number:
  US07/874,136
• Time in Patent Office: 2,976 Days
• Field of Search: 455/26.1, 455/95, 455/151.2, 455/70, 455/38.3, 455/38.2, 455/205, 455/343, 340/825.44, 371/5.5, 371/5.3, 371/5.1, 375/354, 375/368, 375/369, 375/227, 375/222, 375/316
• US Class Current: 340/7.34
• CPC Class Codes: H04W 52/0238 where the received signal is an unwanted signal, e.g. interference or idle signal
• CPC Class Codes: H04W 88/022 Selective call receivers
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A wireless communication system containing at least one transmission apparatus and at least one communication terminal. The transmission apparatus transmits a wireless signal representing a bit sequence containing at least a predetermined number of bit errors, to the communication terminal. The communication terminal 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 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 may transmit a wireless signal representing a bit sequence containing no pattern coinciding with a predetermined frame synchronization pattern, to the communication terminal. The communication terminal 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.

Claims

1. A process for making an operation of an apparatus inactive, by remote control, where the apparatus receives a first bit sequence that follows a predetermined rule, said process comprising:

generating as a second bit sequence an error bit sequence that contains a number of generated bit errors that exceed a predetermined number;

transmitting a wireless signal representing the second bit sequence;

receiving said wireless signal by said apparatus as a received wireless signal;

examining, in said apparatus, a received bit sequence represented by the received wireless signal to determine whether or not the received bit sequence contains the number of bit errors that exceed the predetermined number; and

making the operation of the apparatus inactive and reducing power consumption of the apparatus when it is determined that the received bit sequence contains the number of bit errors that exceed the predetermined number.

2. A wireless communication system, comprising:

at least one wireless communication terminal receiving a first bit sequence following a predetermined rule; and

at least one transmission apparatus for transmitting a wireless signal, to said at least one wireless communication terminal, said transmission apparatus comprising turn-off signal transmission means for generating and transmitting a turn-off signal comprising a second bit sequence that contains a number of generated bit errors that exceed a predetermined number;

said at least one wireless communication terminal comprising;

receiving means for receiving the wireless signal as a received wireless signal, and regenerating a third bit sequence represented by the received wireless signal,

examining means for examining the third bit sequence represented by the received wireless signal to determine whether the third bit sequence contains the number of bit errors that exceed the predetermined number, and

turn-off control means for making the operation of the wireless communication terminal inactive and reducing power consumption of the apparatus when said examining means determines that the third bit sequence contains the number of bit errors that exceed the predetermined number.

3. A wireless communication system according to claim 2, wherein:

said second bit sequence represented by said turn-off signal contains no pattern coinciding with a frame synchronization pattern;

said at least one wireless communication terminal further comprises frame synchronization pattern detection means for trying to detect the frame synchronization pattern in the third bit sequence represented by the received wireless signal; and

said turn-off control means in each wireless communication terminal makes operation of the wireless communication terminal inactive when the frame synchronization pattern detection means fails to detect the frame synchronization pattern in the third bit sequence represented by the received wireless signal.

4. A wireless transmission apparatus, comprising means for transmitting a wireless signal representing a first bit sequence following a predetermined rule, and turn-off signal transmission means for generating and transmitting a turn-off signal representing a second bit sequence including generated and inserted errors that can be detected and cannot be corrected, said turn off signal reducing power consumption in a receiving apparatus.

5. A wireless transmission apparatus according to claim 4, wherein said first bit sequence is formatted in a frame, further contains a frame synchronization pattern for indication a reference frame phase, and the second bit sequence represented by said turn-off signal contains no pattern coinciding with said frame synchronization pattern.

6. A wireless communication terminal receiving a first bit sequence that follows a predetermined rule and receiving a generated second bit sequence that contains a number of generated bit errors that exceed a predetermined number, comprising:

receiving means for receiving a wireless signal as a received wireless signal, and regenerating the second bit sequence represented by the received wireless signal;

examining means for examining the second bit sequence represented by the received wireless signal to determine whether the second bit sequence contains the number of generated bit errors that exceed the predetermined number; and

turn-off control means for making operation of the wireless communication terminal inactive directly responding to the determination, by said examining means, that the number of generated bit errors contained in the bit sequence is equal to or more than the predetermined number.

7. A wireless communication terminal according to claim 6, 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 represented by the turn-off signal contains no pattern coinciding with said frame synchronization pattern;

said wireless communication terminal further comprises frame synchronization pattern detection means for trying to detect the frame synchronization pattern in the received wireless signal; and

said turn-off control means in each wireless communication terminal makes the operation of said wireless communication terminal inactive when the frame synchronization pattern detection means fails to detect the frame synchronization pattern in the received wireless signal.

8. A process for making an operation of an apparatus inactive, by remote control, where the apparatus receives a first bit sequence that follows a predetermined rule, said process comprising;

generating as a second bit sequence an error bit sequence that contains a number of generated bit errors that exceed a predetermined number;

transmitting a wireless signal representing the second bit sequence;

receiving said wireless signal by said apparatus as a received signal;

determining whether the third bit sequence contains the number of bit errors that exceed the predetermined number; and

making the operation of the apparatus inactive and reducing power consumption of the apparatus when the third bit sequence contains the number of generated bit errors that exceed the predetermined number.

9. A wireless paging system, comprising:

a plurality of pager terminals; and

at least one transmission apparatus for transmitting a wireless signal to the plurality of pager terminals, said transmission apparatus comprising;

first signal transmission means for transmitting a first wireless signal representing a first bit sequence generated following a predetermined rule, where said first bit sequence contains a bit error correction code based on an error correction rule for bit error detection and correction, and, in accordance with the error correction rule, at least one bit error contained in the first bit sequence represented by the first wireless signal can be detected, and, when a number of the detected bit errors is less than a predetermined number, the detected bit error can be corrected,

error bit sequence generating means for generating a second bit sequence having generated bit errors that does not satisfy the predetermined rule, and

second signal transmission means for transmitting, following an end of the transmission of said first wireless signal, a second wireless signal representing the second bit sequence containing at Least said predetermined number of bit errors and that does not satisfy the predetermined rule; and

each of said pager terminals comprising;

receiving means for receiving the first and second wireless signals, and regenerating the first and second bit sequences represented by the received first and second wireless signals,

examining means for examining the regenerated first and second bit sequences represented by the received first and second wireless signals to detect bit errors contained in the first and second bit sequences, assuming that the regenerated first and second bit sequences contain a bit error correction code based on said error correction rule and to determine whether one of the regenerated first and second bit sequences follow the predetermined rule, and

sleep mode control means for making the operation of the pager terminal inactive and reducing power consumption of said pager terminal when said examining means detects at least said predetermined number of generated bit errors and that one of the regenerated first and second bit sequences does not follow the predetermined rule.

10. A wireless paging system according to claim 9, wherein each of said pager terminals further comprising intermittent waking means for intermittently making the operation of the pager terminal active while the pager terminal is in the inactive state.

11. A wireless paging system according to claim 9, 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 further comprises frame synchronization pattern detection means for trying to detect the frame synchronization pattern in the first and second bit sequences represented by the received first and second wireless signals; and

said sleep mode control means in each pager terminal makes the operation of the pager terminal inactive when the frame synchronization pattern detection means fails to detect the frame synchronization patter in the second bit sequence represented by the received second wireless signal.

12. A wireless transmission apparatus for transmitting a wireless signal, comprising:

first signal transmission means for transmitting a first signal representing a first bit sequence, where said first bit sequence follows a predetermined rule and contains a bit error correction code based on error correction rule for bit error detection and correction, and, in accordance with the error correction rule, at least one bit error contained in the first bit sequence represented by the first wireless signal can be detected and, when a number of the detected bit errors is less than a predetermined number, the detected bit error can be corrected; and

second signal transmission means for generating and 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 generated bit errors and not following the predetermined rule resulting in reducing power consumption of a wireless reception apparatus.

13. A wireless transmission apparatus according to claim 12, 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.

14. A pager terminal, comprising:

receiving means for receiving a wireless signal as a received wireless signal, and regenerating first and second bit sequences represented by the received wireless signal where the first bit sequence follows a predetermined rule and the second bit sequence does not follow the predetermined rule and contains generated bit errors;

examining means for examining the first and second bit sequences represented by the received wireless signal 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 an error correction rule; and

sleep mode control means for making said pager terminal inactive and reducing power consumption of said pager terminal when said examining means detects at least a predetermined number of the generated bit errors and that the regenerated second bit sequence does not follow the predetermined rule;

said first bit sequence represents a paging signal for paging said pager terminal, and contains a bit error correction code based on said error correction rule;

in accordance with said error correction rule, at least one bit error contained in a bit sequence can be detected, and, when a number of the detected bit errors 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.

15. A pager terminal according to claim 14, further comprising intermittent waking means for intermittently making the operation of the pager terminal active while the pager terminal is in the inactive state.

16. A pager terminal according to claim 14, wherein:

said first bit sequence is formatted in a frame, further contains a frame synchronization patter for indicating a reference frame phase, and said second bit sequence contains no pattern coinciding with said frame synchronization pattern;

said pager terminal further comprises 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 signal; and

said sleep mode control means in each pager terminal makes the operation of said pager terminal inactive when the frame synchronization pattern detection means fails to detect the frame synchronization pattern in the received wireless signal.

17. A method of controlling a pager, comprising:

generating and inserting a first number of errors into a message with the first number of errors in the message exceeding a second number of errors that are correctable by the pager;

transmitting a frame synchronization pattern followed by the message to the pager; and

reducing power consumption of the pager when a detected number of errors in the message exceeds the second number.

18. A process for making putting operation of an apparatus into a sleep mode when in a working mode during which a signal receiving function is continuously powered, by remote control, where the apparatus receives a first bit sequence that follows a predetermined rule, said process comprising:

generating as a second bit sequence an error bit sequence that contains a number of generated bit errors that exceed a predetermined number;

transmitting a wireless signal representing the second bit sequence;

receiving said wireless signal by said apparatus as a received wireless signal;

examining, in said apparatus, a received bit sequence represented by the received wireless signal to determine whether or not the received bit sequence contains the number of bit errors that exceed the predetermined number; and

putting the operation of the apparatus into the sleep mode and reducing power consumption of the apparatus when it is determined that the received bit sequence contains the number of bit errors that exceed the predetermined number.

19. A wireless communication system, comprising:

at least one wireless communication terminal receiving a first bit sequence following a predetermined rule; and

at least one transmission apparatus for transmitting a wireless signal, to said at least one wireless communication terminal, said transmission apparatus comprising turn-off signal transmission means for generating and transmitting a turn-off signal comprising a second bit sequence that contains a number of generated bit errors that exceed a predetermined number;

said at least one wireless communication terminal comprising;

receiving means for receiving the wireless signal as a received wireless signal, and regenerating a third bit sequence represented by the received wireless signal,

examining means for examining the third bit sequence represented by the received wireless signal to determine whether the third bit sequence contains the number of bit errors that exceed the predetermined number, and

turn-off control means for placing the operation of the wireless communication terminal in a sleep mode when in a working mode during which a signal receiving function is continuously powered and reducing power consumption of the apparatus when said examining means determines that the third bit sequence contains the number of bit errors that exceed the predetermined number.

20. A wireless transmission apparatus, comprising means for transmitting a wireless signal representing a first bit sequence following a predetermined rule, and turn-off signal transmission means for generating and transmitting a turn-off signal representing a second bit sequence including generated and inserted errors that can be detected and cannot be corrected, said turn off signal reducing power consumption in a receiving apparatus by placing the receiving apparatus in a sleep mode from a working mode during which a signal receiving function is continuously powered.

21. A wireless communication terminal receiving a first bit sequence that follows a predetermined rule and receiving a generated second bit sequence that contains a number of generated bit errors that exceed a predetermined number, comprising:

receiving means for receiving a wireless signal as a received wireless signal, and regenerating the second bit sequence represented by the received wireless signal;

examining means for examining the second bit sequence represented by the received wireless signal to determine whether the second bit sequence contains the number of generated bit errors that exceed the predetermined number; and

turn-off control means for placing operation of the wireless communication terminal into a sleep mode from a working mode, during which a signal receiving function is continuously powered, directly responding to the determination, by said examining means, that the number of generated bit errors contained in the bit sequence is equal to or more than the predetermined number.

22. A process for making an operation of an apparatus inactive, by remote control, where the apparatus receives a first bit sequence that follows a predetermined rule, said process comprising:

generating as a second bit sequence an error bit sequence that contains a number of generated bit errors that exceed a predetermined number;

transmitting a wireless signal representing the second bit sequence;

receiving said wireless signal by said apparatus as a received signal;

determining whether the third bit sequence contains the number of bit errors that exceed the predetermined number; and

placing the operation of the apparatus into a sleep mode from a working mode during which a signal receiving function is continuously powered and reducing power consumption of the apparatus when the third bit sequence contains the number of generated bit errors that exceed the predetermined number.

23. A wireless paging system, comprising:

a plurality of pager terminals; and

at least one transmission apparatus for transmitting a wireless signal to the plurality of pager terminals, said transmission apparatus comprising;

first signal transmission means for transmitting a first wireless signal representing a first bit sequence generated following a predetermined rule, where said first bit sequence contains a bit error correction code based on an error correction rule for bit error detection and correction, and, in accordance with the error correction rule, at least one bit error contained in the first bit sequence represented by the first wireless signal can be detected, and, when a number of the detected bit errors is less than a predetermined number, the detected bit error can be corrected,

error bit sequence generating means for generating a second bit sequence having generated bit errors that does not satisfy the predetermined rule, and

second signal transmission means for transmitting, following an end of the transmission of said first wireless signal, a second wireless signal representing the second bit sequence containing at least said predetermined number of bit errors and that does not satisfy the predetermined rule; and

each of said pager terminals comprising;

receiving means for receiving the first and second wireless signals, and regenerating the first and second bit sequences represented by the received first and second wireless signals,

examining means for examining the regenerated first and second bit sequences represented by the received first and second wireless signals to detect bit errors contained in the first and second bit sequences, assuming that the regenerated first and second bit sequences contain a bit error correction code based on said error correction rule and to determine whether one of the regenerated first and second bit sequences follow the predetermined rule, and

sleep mode control means for placing the operation of the pager terminal into a sleep mode from a working mode during which a signal receiving function is continuously powered and reducing power consumption of said pager terminal when said examining means detects at least said predetermined number of generated bit errors and that one of the regenerated first and second bit sequences does not follow the predetermined rule.

24. A wireless transmission apparatus for transmitting a wireless signal, comprising:

first signal transmission means for transmitting a first signal representing a first bit sequence, where said first bit sequence follows a predetermined rule and contains a bit error correction code based on error correction rule for bit error detection and correction, and, in accordance with the error correction rule, at least one bit error contained in the first bit sequence represented by the first wireless signal can be detected and, when a number of the detected bit errors is less than a predetermined number, the detected bit error can be corrected; and

second signal transmission means for generating and 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 generated bit errors and not following the predetermined rule resulting in reducing power consumption of a wireless reception apparatus by placing the apparatus in a sleep mode from a working mode during which a signal receiving function of the apparatus is continuously powered.

25. A pager terminal, comprising:

receiving means for receiving a wireless signal as a received wireless signal, and regenerating first and second bit sequences represented by the received wireless signal where the first bit sequence follows a predetermined rule and the second bit sequence does not follow the predetermined rule and contains generated bit errors;

examining means for examining the first and second bit sequences represented by the received wireless signal 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 an error correction rule; and

sleep mode control means for placing said pager terminal in a sleep mode from a working mode during which a signal receiving function of the apparatus is continuously powered and reducing power consumption of said pager terminal when said examining means detects at least a predetermined number of the generated bit errors and that the regenerated second bit sequence does not follow the predetermined rule;

said first bit sequence represents a paging signal for paging said pager terminal, and contains a bit error correction code based on said error correction rule;

in accordance with said error correction rule, at least one bit error contained in a bit sequence can be detected, and, when a number of the detected bit errors 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.