INTERFERING IN TIME-DIVISION DUPLEX COMMUNICATION

• US 20200029337A1
• Filed: 07/17/2019
• Published: 01/23/2020
• Est. Priority Date: 07/22/2018
• Status: Active Grant

• Current Assignee: D-Fend Solutions Ad Ltd.
• Original Assignee: D-Fend Solutions Ad Ltd.
• Inventors: LEIZEROVICH, Hanan, Monsa Chermon, Assaf
• Granted Patent: US 10,728,906 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 7/18504 Aircraft used as relay or high altitude atmospheric platform
• CPC Class Codes: H04B 7/212 Time-division multiple access [TDMA]
• CPC Class Codes: H04B 7/265 for channel frequency control
• CPC Class Codes: H04K 3/41 characterized by the control of the jamming activation or deactivation time control of jamming activation and deactivation time only for the purpose of alternating between jamming mode and target monitoring mode H04K3/45
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/143 for modulated signals H04L5/1469 takes precedence
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/541 using the level of interference

Abstract

A method is presented for disconnecting a wireless time-division duplex communication link between two nodes. A first node transmits during time slots allocated to the first node and the second node transmits during separate time slots allocated to the second node. The first node transmits at differing respective frequency bands during its time slots. The method includes:

• • sub-dividing a time slot allocated to the first node into consecutive time intervals; and
  • transmitting respective disconnect signals during the time intervals. Each of the disconnect signals is transmitted on a frequency band used by the first node. The disconnect signals are transmitted on different frequency bands during at least two of the time intervals.

Claims

1. A method for disconnecting a wireless time-division duplex communication link, said time-division duplex communication link being between a first node transmitting during time slots allocated to said first node and a second node transmitting during separate time slots allocated to said second node, said first node transmitting at a respective one of a plurality of frequency bands during each of said time slots allocated to said first node, said method comprising:

sub-dividing a time slot allocated to said first node into consecutive time intervals;

transmitting, using a transmitter, respective disconnect signals during a plurality of said time intervals, each of said disconnect signals being transmitted on a respective one of said plurality of frequency bands, wherein for at least two of said time intervals said disconnect signals are transmitted on different frequency bands.

2. A method according to claim 1, wherein for at least one of said time intervals said disconnect signal is data modulated.

3. A method according to claim 1, wherein for at least one of said time intervals said disconnect signal is modulated with a disconnect command for said second node.

4. A method according to claim 1, wherein for at least one of said time intervals said disconnect signal is modulated with a pseudo-random data sequence.

5. A method according to claim 1, wherein for at least one of said time intervals said disconnect signal comprises one of:

a predefined jamming signal; and

a random noise signal.

6. A method according to claim 1, further comprising:

monitoring transmissions by said second node; and

predicting an upcoming time slot of said first node based on said monitored transmissions.

7. A method according to claim 1, further comprising initiating said transmitting of said disconnect signals when a cessation of transmission by said second node is detected.

8. A method according to claim 1, further comprising:

analyzing transmissions by said second node to identify a disconnection of communication between said first and second nodes; and

when said disconnection is identified, establishing direct communication with said second node.

9. A method according to claim 1, further comprising selecting said respective frequency bands from a specified list of frequency bands.

10. A method according to claim 1, wherein, during a single time slot, disconnect signals are transmitted over an entire frequency range used by said first node.

11. A method according to claim 1, wherein said first node transmits in a known order of said frequency bands, further comprising:

transmitting said disconnect signals in said known order; and

changing a phase of said order of transmitted disconnect signals by transmitting one of said disconnect signals at frequency band out of said known order and continuing subsequent disconnect signal transmissions in said known order.

12. A method according to claim 1, wherein an entire frequency range used by said first node is interfered with by said disconnect signals during a single time slot of said first node.

13. A method according to claim 1, further comprising transmitting, for at least one of said time intervals, at least two disconnect signals in parallel on respective ones of said frequency bands, wherein a number of disconnect signals transmitted in parallel is fewer than a total number of said frequency bands.

14. A method according to claim 1, further comprising transmitting a first sub-set of said frequency bands during said time slot of said first node and a second sub-set of said frequency bands during a subsequent time slot of said first node.

15. A method for controlling an apparatus interfering with wireless time-division duplex communication, said time-division duplex communication being between a first node transmitting during time slots allocated to said first node and a second node transmitting during separate time slots allocated to said second node, said first node transmitting at a respective one of a plurality of frequency bands during each of said time slots allocated to said first node, comprising:

receiving, using a receiver, wireless transmissions from said second node;

determining a time slot allocated to said first node based on said received transmissions and subdividing said determined time slot into consecutive time intervals; and

instructing said apparatus to transmit respective disconnect signals during a plurality of said time intervals, each of said disconnect signals being for transmission on a respective one of said plurality of frequency bands, wherein for at least two of said time intervals said disconnect signals are transmitted on different frequency bands.

16. A method according to claim 15, further comprising providing to said apparatus at least one signal parameter for generation of said disconnect signals.

17. A method according to claim 16, wherein said at least one signal parameter comprises:

a type of disconnect signal to transmit;

data for modulating onto a disconnect signal;

a duration of said time slot;

respective durations of said time intervals;

said respective frequency bands for said disconnect signals;

respective transmission powers for said disconnect signals; and

a number of disconnect signals to transmit in parallel.

18. A method according to claim 15, wherein said instructing comprises instructing said apparatus to transmit, on at least one of said disconnect signals, a disconnect command for disconnecting said second node from said first node.

19. A method according to claim 15, further comprising:

detecting, from said received transmissions, a disconnection of communication between said first and second nodes; and

instructing said apparatus to establish direct communication with said second node.

20. An apparatus for disconnecting a wireless time-division duplex communication link, said time-division duplex communication link being between a first node transmitting during time slots allocated to said first node and a second node transmitting during separate time slots allocated to said second node, said first node transmitting at a respective one of a plurality of frequency bands during each of said time slots allocated to said first node, comprising:

a signal generator adapted to;

sub-divide a time slot allocated to said first node into consecutive time intervals; and

generate respective disconnect signals for a plurality of said time intervals, each of said disconnect signals occupying a respective one of said plurality of frequency bands, wherein for at least two of said time intervals said disconnect signals occupy different frequency bands; and

a wireless transmitter, associated with said signal generator, adapted to transmit said disconnect signals at said respective time intervals.

21. An apparatus according to claim 20, wherein for at least one of said time intervals said disconnect signal is modulated with one of:

a disconnect command for said second node;

a pseudo-random data sequence;

a predefined jamming sequence; and

a noise signal.

22. An apparatus according to claim 20, wherein said signal generator is further adapted to select said respective frequency bands for said disconnect signals from a specified list of frequency bands.

23. An apparatus according to claim 20, wherein said signal generator is further adapted to select said respective frequency bands for said disconnect signals as successive frequency bands over a frequency range used by said first node.

24. An apparatus according to claim 20, wherein during a single time slot of said first node an entire frequency range used by said first node is interfered with by said disconnect signals.

25. A controller for a wireless disconnect apparatus, said disconnect apparatus being for interfering with wireless time-division duplex communication link between a first node transmitting during time slots allocated to said first node and a second node transmitting during separate time slots allocated to said second node, said first node transmitting at a respective one of a plurality of frequency bands during each of said time slots allocated to said first node, comprising:

a receiver adapted to receive wireless transmissions from said second node;

a signal analyzer associated with said receiver, adapted to;

determine a time slot allocated to said first node based on said received transmissions;

subdivide said time slot into consecutive time intervals; and

instruct said disconnect apparatus to transmit respective disconnect signals during a plurality of said time intervals, each of said disconnect signals being for transmission on a respective one of said plurality of frequency bands, wherein for at least two of said time intervals said disconnect signals are transmitted on different frequency bands.

26. A controller according to claim 25, further adapted to instruct said disconnect apparatus to transmit a disconnect signal for disconnecting said second node from said first node on at least one of said disconnect signals.

27. A controller according to claim 25, further adapted to provide to said disconnect apparatus at least one signal parameter for generation of said disconnect signals, said at least one signal parameter comprising:

a type of disconnect signal to transmit;

data for modulating onto a disconnect signal;

a duration of said time slot;

respective durations of said time intervals;

said respective frequency bands for said disconnect signals; and

respective transmission powers for said disconnect signals.

28. A controller according to claim 25, wherein said signal analyzer is further adapted to:

detect, from said received transmissions, a disconnection of communication between said first and second nodes; and

instruct said disconnect apparatus to establish direct communication with said second node.