Digital radio mobile frequency supervision

• US 5,245,610 A
• Filed: 05/20/1991
• Issued: 09/14/1993
• Est. Priority Date: 05/20/1991
• Status: Expired due to Term

• Current Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Lindell, Karl B.
• Primary Examiner(s): Olms, Douglas W.
• Assistant Examiner(s): Patel, Ajit
• Application Number:
  US07/702,962
• Time in Patent Office: 848 Days
• Field of Search: 379/58, 379/59, 379/60, 379/63, 455/33.1, 455/33.2, 455/33.3, 455/33.4, 455/5.1, 455/69, 455/51.1, 455/54.1, 455/54.2, 455/56.1, 455/37.1, 455/71, 455/119, 455/53.1, 370/13, 370/17, 370/50, 370/95.1, 370/95.2
• US Class Current: 370/329
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 88/08 Access point devices
• CPC Class Codes: Y10S 370/913 Wireless or radio

Abstract

The frequency stability of the signals transmitted by a plurality of mobile stations to an associated base station within a radio network is supervised by first generating a reference signal at the base station. The signals received from the mobile stations are compared to the reference signal and a difference signal is generated. The difference signal is compared to first and second error values and if the difference exceeds the first error value, the mobile is summoned for a service adjustment. If the difference exceeds the second error value, the mobile is disabled from further transmissions.

Claims

1. A method for supervising a plurality of mobile stations which broadcast to an associated base station within a mobile radio system network to detect mobile stations of said plurality of mobile stations which transmit signals at other than desired frequency, said method comprising:

transmitting a signal from each of said mobile stations to an associated base station, each of said transmitted signals including information which identifies a particular mobile station broadcasting the signal;

receiving at a base station a signal from an associated mobile station;

generating in said base station a reference signal having a frequency related to the desired frequency of transmission of the mobile station from which a signal was received;

comparing the frequency of the signal received from the associated mobile station to said reference signal;

generating a difference signal indicative of the difference between the compared signals;

comparing said difference signal to a first preselected threshold error value indicative of a first degree of difference between the frequency of said reference signal and the frequency of the transmission received from said associated mobile station; and

identifying said mobile station as needing a mobile station service adjustment in response to said difference exceeding said first preselected threshold error value.

2. A method for supervising the frequency stability of signals transmitted by a plurality of mobile stations which broadcast to an associated base station within a mobile radio system network as set forth in claim 1, which also includes:

determining from the signal received by the base station from said associated mobile station the identity of said mobile station.

3. A method for supervising the frequency stability of signals transmitted by a plurality of mobile stations which broadcast to an associated base station within a mobile radio system network as set forth in claim 1, in which:

each of said signals transmitted from said mobile stations to an associated base station are broadcast in burst mode.

4. A method for supervising the frequency stability of signals transmitted by a plurality of mobile stations which broadcast to an associated base station within a mobile radio system network as set forth in claim 3 wherein said mobile radio system network is a packet data network and which also includes the steps of:

determining when a complete data frame has been received within the burst of data transmitted from said mobile station;

determining whether the received data contains more than a preselected number of data errors before performing said comparing the frequency step.

5. A method for supervising the frequency stability of signals transmitted by a plurality of mobile stations which broadcast to an associated base station within a mobile radio system network as set forth in claim 3 wherein said mobile radio system network is a packet data and in which said burst of data transmitted by said mobile station is formatted in accordance with a protocol which includes:

a bit synchronization block having a fixed configuration of data;

a frame head including a base station identity block;

a primary block including a mobile station identity field; and

a parity field which includes information for error detection and correction.

6. A method for supervising the frequency stability of signals transmitted by a plurality of mobile stations which broadcast to an associated base station within a mobile radio system network as set forth in claim 5 wherein said mobile radio system network is a packet data and in which said comparing step includes:

comparing the frequency of the signal received from said associated mobile station during the portion of the burst containing the bit synchronization block.

7. A method for supervising the frequency stability of signals transmitted by a plurality of mobile stations which broadcast to an associated base station within a mobile radio system network as set forth in claim 1, in which said means for comparing the frequency of the signal received from the associated mobile station to said reference signal includes:

means for deriving an intermediate frequency signal from the signal received from said associated mobile station prior to comparing.

8. A method for supervising a plurality of mobile stations which broadcast to an associated base station within a mobile radio system network to detect mobile stations of said plurality of mobile stations which transmit signals at other than desired frequency, said method comprising:

transmitting a signal from each of said mobile stations to an associated base station, each of said transmitted signals including information which identifies a particular mobile station broadcasting the signal;

receiving at a base station a signal from an associated mobile station;

generating in said base station a reference signal having a frequency related to the desired frequency of transmission of the mobile station from which a signal was received;

comparing the frequency of the signal received from the associated mobile station to said reference signal;

generating a difference signal indicative of the difference between the compared signals;

comparing said difference signal to a first preselected threshold error value indicative of a first degree of difference between the frequency of said reference signal and the frequency of the transmission received from said associated mobile station;

identifying said mobile station as needing a mobile station service adjustment in response to said difference exceeding said first preselected threshold error value;

comparing said difference signal to a second preselected threshold error value greater than said first error value and indicative of a second degree of difference between the frequency of said reference signal and the frequency of the transmission received from said associated mobile station; and

disabling further transmissions by said mobile station in response to said second degree of difference exceeding said second preselected threshold error value.

9. A method for supervising a plurality of mobile stations which broadcast to an associated base station within a mobile radio system network to detect mobile stations of said plurality of mobile stations which transmit signals at other than desired frequency, said method comprising:

transmitting a signal from each of said mobile stations to an associated base station, each of said transmitted signals including information which identifies a particular mobile station broadcasting the signal;

receiving at a base station a signal from an associated mobile station;

generating in said base station a reference signal having a frequency related to the desired frequency of transmission of the mobile station from which a signal was received;

comparing the frequency of the signal received from the associated mobile station to said reference signal by counting a preselected number of cycles of a signal derived from the signal received from the mobile station and generating a periodic gating signal, counting the number of cycles of a signal derived from the reference signal which occur between successive gating signals and comparing the number of cycles counted with a value related to the frequency received from said mobile station;

generating a difference signal indicative of the difference between the compared signals;

comparing said difference signal to a first preselected threshold error value indicative of a first degree of difference between the frequency of said reference signal and the frequency of the transmission received from said associated mobile station; and

identifying said mobile station as needing a mobile station service adjustment in response to said first degree of difference exceeding said first preselected threshold error value.

10. A method for supervising a plurality of mobile stations which broadcast in burst mode to an associated base station within a mobile radio system network to detect mobile stations of said plurality of mobile stations which transmit signals at other than desired frequency, said mobile radio system network being a packet data network, said method comprising:

transmitting a signal from each of said mobile stations to an associated base station, each of said transmitted signals including information which identifies a particular mobile station broadcasting the signal;

receiving at a base station a signal broadcast from an associated mobile station;

generating in said base station a reference signal broadcast having a frequency related to the desired frequency of transmission of the mobile station from which a signal was received;

comparing the frequency of the signal received from the associated mobile station to said reference signal during a period in which the mean value of the modulation deviation is zero;

generating a difference signal indicative of the difference between the compared signals;

comparing said difference signal to a first preselected threshold error value indicative of a first degree of difference between the frequency of said reference signal and the frequency of the transmission received from said associated mobile station; and

identifying said mobile station as needing a mobile station service adjustment in response to said first degree of difference exceeding said first preselected threshold error value.

11. A method for supervising a plurality of mobile stations which broadcast in burst mode to an associated base station within a mobile radio system network to detect mobile stations of said plurality of mobile stations which transmit signals at other than desired frequency, said mobile radio system network being a packet data network, said method comprising:

transmitting a signal from each of said mobile stations to an associated base station, each of said transmitted signals including information which identifies a particular mobile station broadcasting the signal;

receiving at a base station a signal from an associated mobile station;

generating in said base station a reference signal having a frequency related to the desired frequency of transmission of the mobile station from which a signal was received;

demodulating at least part of a data packet;

determining a mean value of said demodulated data packet;

correction for the mean value error of said data packet;

comparing the frequency of the signal received from the associated mobile station to said reference signal;

generating a difference signal indicative of the difference between the compared signals;

comparing said difference signal to a first preselected threshold error value indicative of a first degree of difference between the frequency of said reference signal and the frequency of the transmission received from said associated mobile station; and

identifying said mobile station as needing a mobile station service adjustment in response to said first degree of difference exceeding said first preselected threshold error value.

12. A method for supervising a plurality of mobile stations which broadcast in burst mode to an associated base station within a mobile radio system network to detect mobile stations of said plurality of mobile stations which transmit signals at other than desired frequency, said mobile radio system network being a packet data network, said method comprising:

transmitting a signal from each of said mobile stations to an associated base station, each of said transmitted signals including information which identifies a particular mobile station broadcasting the signal;

receiving at a base station a signal broadcast from an associated mobile station;

generating in said base station a reference signal having a frequency related to the desired frequency of transmission of the mobile station from which a signal was received;

coding the data packets to reduce a mean value error therein;

comparing the frequency of the signal received from the associated mobile station to said reference signal using at least part of the whole data packet without correction for mean value error;

generating a difference signal indicative of the difference between the compared signals;

comparing said difference signal to a first preselected threshold error value indicative of a first degree of difference between the frequency of said reference signal and the frequency of the transmission received from said associated mobile station; and

identifying said mobile station as needing a mobile station service adjustment in response to said first degree of difference exceeding said first preselected threshold error value.

13. A method for supervising a plurality of mobile stations which broadcast in burst mode to an associated base station within a mobile radio system network to detect mobile stations of said plurality of mobile stations which transmit signals at other than desired frequency, said mobile radio system network being a packet data network, said method comprising:

transmitting a signal from each of said mobile stations to an associated base station, each of said transmitted signals including information which identifies a particular mobile station broadcasting the signal;

receiving at a base station a signal from an associated mobile station;

generating in said base station a reference signal having a frequency related to the desired frequency of transmission of the mobile station from which a signal was received;

comparing the frequency of the signal received from the associated mobile station to said reference signal;

generating a difference signal indicative of the difference between the compared signals;

comparing said difference signal to a first preselected threshold error value indicative of a first degree of difference between the frequency of said reference signal and the frequency of the transmission received from said associated mobile station;

identifying, including by recognizing the mobile station identity field within a primary block of the data burst, said mobile station as needing a mobile station service adjustment in response to said first degree of difference exceeding said first preselected threshold error value; and

determining the signal received by the base station from said associated mobile station the identity of said mobile station.

14. A method for supervising a plurality of mobile stations which broadcast to an associated base station within a mobile radio system network having a control center connected to each of the base stations to detect mobile stations of said plurality of mobile stations which transmit signals at other than desired frequency, said method comprising:

transmitting a signal from each of said mobile stations to an associated base station, each of said transmitted signals including information which identifies a particular mobile station broadcasting the signal;

receiving at a base station a signal from an associated mobile station;

generating in said base station a reference signal having a frequency related to the desired frequency of transmission of the mobile station from which a signal was received;

deriving an intermediate frequency signal from the signal received from said associated mobile station;

comparing the frequency of the signal received from the associated mobile station to said reference signal;

generating a difference signal indicative of the difference between the compared signals;

comparing said difference signal to a first preselected threshold error value indicative of a first degree of difference between the frequency of said reference signal and the frequency of the transmission received from said associated mobile station; and

identifying said mobile station as needing a mobile station service adjustment in response to said first degree of difference exceeding said first preselected threshold error value.

15. A system for supervising a plurality of mobile stations which broadcast to an associated base station within a mobile radio system network to detect mobile stations of said plurality of mobile stations which transmit signals at other than desired frequency, said system comprising:

means for transmitting a signal from each of said mobile stations to an associated base station, each of said transmitted signals including information which identifies a particular mobile station broadcasting the signal;

means for receiving at a base station a signal from an associated mobile station;

means for generating in said base station a reference signal having a frequency related to the desired frequency of transmission of the mobile station from which a signal was received;

means for comparing the frequency of the signal received from the associated mobile station to said reference signal;

means for generating a difference signal indicative of the difference between the compared signals;

means for comparing said difference signal to a first preselected threshold error value indicative of a first degree of difference between the frequency of said reference signal and the frequency of the transmission received from said associated mobile station; and

means for identifying said mobile station as needing a mobile station service adjustment in response to said first degree of difference exceeding said first preselected threshold error value.

16. A system for supervising the frequency stability of signals transmitted by a plurality of mobile stations which broadcast to an associated base station within a mobile radio system network as set forth in claim 15, which also includes:

means for determining from the signal received by the base station from said associated mobile station the identity of said mobile station.

17. A system for supervising the frequency stability of signals transmitted by a plurality of mobile stations which broadcast to an associated base station within a mobile radio system network as set forth in claim 16 wherein said mobile radio system network is a packet data network and in which said means for determining the identity of said mobile station includes:

means for recognizing the mobile station identity field within the primary block of the data burst.

18. A system for supervising the frequency stability of signals transmitted by a plurality of mobile stations which broadcast to an associated base station within a mobile radio system network as set forth in claim 15, in which:

each of said signals transmitted from said mobile stations to an associated base station are broadcast in burst mode.

19. A system for supervising the frequency stability of signals transmitted by a plurality of mobile stations which broadcast to an associated base station within a mobile radio system network as set forth in claim 18 wherein said mobile radio system network is a packet data network and in which said burst of data transmitted by said mobile station is formatted in accordance with a protocol which includes:

a bit synchronization block having a fixed configuration of data;

a frame head including a base station identity block;

a primary block including a mobile station identity field; and

a parity field which includes information for error detection and correction.

20. A system for supervising the frequency stability of signals transmitted by a plurality of mobile stations which broadcast to an associated base station within a mobile radio system network having a control center connected to each of the base stations as set forth in claim 18 wherein said mobile radio system network is a packet data network and which also includes:

means for determining when a complete data frame has been received within the burst of data transmitted from said mobile station; and

means for determining whether the received data contains more than a preselected number of data errors before performing said comparing the frequency step.

21. A system for supervising the frequency stability of signals transmitted by a plurality of mobile stations which broadcast to an associated base station within a mobile radio system network as set forth in claim 18 wherein said mobile radio system network is a packet data network in which said means for comparing includes means for comparing during a period in which the mean value of the modulation deviation is zero.

22. A system for supervising a plurality of mobile stations which broadcast to an associated base station within a mobile radio system network to detect mobile stations of said plurality of mobile stations which transmit signals at other than desired frequency, said system comprising:

means for transmitting a signal from each of said mobile stations to an associated base station, each of said transmitted signals including information which identifies a particular mobile station broadcasting the signal;

means for receiving at a base station a signal from an associated mobile station;

means for generating in said base station a reference signal having a frequency related to the desired frequency of transmission of the mobile station from which a signal was received;

means for comparing the frequency of the signal received from the associated mobile station to said reference signal;

means for generating a difference signal indicative of the difference between the compared signals;

means for comparing said difference signal to a first preselected threshold error value indicative of a first degree of difference between the frequency of said reference signal and the frequency of the transmission received from said associated mobile station;

means for identifying said mobile station as needing a mobile station service adjustment in response to said first degree of difference exceeding said first preselected threshold error value;

means for comparing said difference signal to a second preselected threshold error value greater than said first preselected threshold error value and indicative of a second degree of difference between the frequency of said reference signal and the frequency of the transmission received from said associated mobile station; and

means for disabling further transmission by said mobile station in response to said second degree of difference exceeding said second preselected threshold error value.

23. A system for supervising a plurality of mobile stations which broadcast to an associated base station within a mobile radio system network to detect mobile stations of said plurality of mobile stations which transmit signals at other than desired frequency, said system comprising:

means for transmitting a signal from each of said mobile stations to an associated base station, each of said transmitted signals including information which identifies a particular mobile station broadcasting the signal;

means for receiving at a base station a signal from an associated mobile station;

means for generating in said base station a reference signal having a frequency related to the desired frequency of transmission of the mobile station from which a signal was received;

means for comparing the frequency of the signal received from the associated mobile station to said reference signal, including by means for counting a preselected number of cycles of a signal derived from the signal received from the mobile station and generating a periodic gating signal, means for counting the number of cycles of a signal derived from the reference signal which occur between successive gating signals, and means for comparing the number of cycles counted with a value related to the frequency received from said mobile station;

means for generating a difference signal indicative of the difference between the compared signals;

means for comparing said difference signal to a first preselected threshold error value indicative of a first degree of difference between the frequency of said reference signal and the frequency of the transmission received from said associated mobile station; and

means for identifying said mobile station as needing a mobile station service adjustment in response to said first degree of difference exceeding said first preselected threshold error value.

24. A system for supervising the frequency stability of signals transmitted by a plurality of mobile stations which broadcast to an associated base station within a mobile radio system network as set forth in claim 23 wherein said mobile radio system network is a packet data network and in which said comparing means includes:

means for comparing the frequency of the signal received from said associated mobile station during the portion of the burst containing the bit synchronization block.

25. A method for supervising a plurality of mobile stations which broadcast in burst mode to an associated base station within a mobile radio system network to detect mobile stations of said plurality of mobile stations which transmit signals at other than desired frequency, said mobile radio system network being a packet data network, said system comprising:

means for transmitting a signal from each of said mobile stations to an associated base station, each of said transmitted signals including information which identifies a particular mobile station broadcasting the signal;

means for receiving at a base station a signal from an associated mobile station;

means for generating in said base station a reference signal having a frequency related to the desired frequency of transmission of the mobile station from which a signal was received;

means for demodulating at least part of a data packet;

means for determining a mean value of said demodulated data packet;

means for correcting for the mean value error of said data packet;

means for comparing the frequency of the signal received from the associated mobile station to said reference signal;

means for generating a difference signal indicative of the difference between the compared signals;

means for comparing said difference signal to a first preselected threshold error value indicative of a first degree of difference between the frequency of said reference signal and the frequency of the transmission received from said associated mobile station; and

means for identifying said mobile station as needing a mobile station service adjustment in response to said first degree of difference exceeding said first preselected threshold error value.

26. A method for supervising a plurality of mobile stations which broadcast in burst mode to an associated base station within a mobile radio system network, to detect mobile stations of said plurality of mobile stations which transmit signals at other than desired frequency, said mobile radio system network being a packet data network said system comprising:

means for transmitting a signal from each of said mobile stations to an associated base station, each of said transmitted signals including information which identifies a particular mobile station broadcasting the signal;

means for receiving at a base station a signal from an associated mobile station;

means for generating in said base station a reference signal having a frequency related to the desired frequency of transmission of the mobile station from which a signal was received;

means for coding the data packets to reduce the mean value error therein;

means for using at least part of the whole data packet without correction for mean value error;

means for comparing the frequency of the signal received from the associated mobile station to said reference signal;

means for generating a difference signal indicative of the difference between the compared signals;

means for comparing said difference signal to a first preselected threshold error value indicative of a first degree of difference between the frequency of said reference signal and the frequency of the transmission received from said associated mobile station; and

means for identifying said mobile station as needing a mobile station service adjustment in response to said first degree of difference exceeding said first preselected threshold error value.