Apparatus and method for controlling wireless communication signals

• US 7,454,222 B2
• Filed: 11/23/2001
• Issued: 11/18/2008
• Est. Priority Date: 11/22/2000
• Status: Active Grant

• Current Assignee: COMS IP Holdings LLC, Transform-X, Inc.
• Original Assignee: DragonWave Incorporated
• Inventors: Huang, Jun, Duxbury, Tom
• Primary Examiner(s): Beamer; Temica M
• Application Number:
  US09/990,349
• Publication Number:
  US 20020061073A1
• Time in Patent Office: 2,552 Days
• Field of Search: 455/422.1, 455/435.5, 455/445, 455/453
• US Class Current: 455/522
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 27/0008 arrangements for allowing a transmitter or receiver to use more than one type of modulation negotiating modulation type for two-way transmission paths H04L5/1453

Abstract

An apparatus and method for controlling wireless communication signals is provided, in which a wireless transmitter in a communication network generates a signal carrying data for wireless transmission, and is capable of varying the data carrying capacity of the wireless transmission channel in response to the quantity of data received for wireless transmission. A monitor is provided to monitor the quantity of received data and the capacity of the communication channel is increased if the monitored quantity exceeds a predetermined threshold. The capacity of the communication channel can be varied by varying the level of modulation and/or by varying the level of code inserted into the data stream. The output power of the wireless transmission signal may be varied in response to the quantity of received data.

Claims

1. A fixed-position wireless transmitter for generating a signal for wireless transmission comprising signal generating means for receiving data and generating a signal containing received data for wireless transmission at a frequency at or above 2 GHz which causes said wireless signal to be attenuated by atmospheric precipitation, monitoring means for monitoring the quantity of data supplied to said signal generating means for wireless transmission, and control means for controlling the power of the generated wireless signal within a range reserved to compensate for attenuation by atmospheric precipitation in response to said monitored quantity of data for wireless transmission.

2. A fixed-position wireless transmitter as claimed in claim 1, further comprising request generating means for generating a request to increase the power of said wireless signal, receiving means for receiving a signal indicating whether permission to increase the power is granted or denied, and wherein said control means is adapted to control said power in response to the received signal.

3. A fixed-position wireless transmitter as claimed in claim 1, further comprising notification generating means for generating a signal based on the power of said wireless signal and means for transmitting the notification signal.

4. A fixed-position wireless transmitter as claimed in claim 1, further comprising comparing means for comparing a parameter indicative of the monitored quantity of data for wireless transmission with a predetermined threshold value, and wherein said controller is arranged to control said signal generating means to decrease said power in response to said parameter decreasing from a value at or above said predetermined threshold to a value below said predetermined threshold.

5. A fixed-position wireless transmitter as claimed in claim 1, further comprising memory means storing a parameter indicative of the maximum output power level for the wireless transmission signal that does not interfere with another wireless signal.

21. A fixed-position wireless transmitter as claimed in claim 1, further comprising receiving means for receiving a signal identifying the fixed-position wireless transmitter and indicating that the wireless signal transmitted thereby is causing interference, and wherein said control means is adapted to reduce said power in response to the received signal.

22. A fixed-position wireless transmitter as claimed in claim 1, wherein said control means is operable to increase said power without requesting permission.

23. A fixed-position wireless transmitter as claimed in claim 1, wherein said controller is responsive to the quantity of data falling below a threshold level to reduce the power of said wireless signal to a value below a normal value reserved for said transmitter.

24. A fixed-position wireless transmitter as claimed in claim 23, further comprising a controller for controlling the data carrying capacity of the wireless signal, and operative to reduce said capacity in response to the quantity of data falling below said predetermined threshold.

6. An apparatus for generating a signal for wireless transmission, comprising signal generating means for receiving data and generating an output signal containing received data for wireless transmission, monitoring means for monitoring the quantity of data supplied to said generating means for wireless transmission and a controller for controlling said signal generating means to vary the rate at which data is output from said signal generating means in said output signal in response to said monitored quantity of data for wireless transmission, wherein said signal generating means includes signal encoding means for inserting code into said data, and said controller is arranged to control the quantity of code inserted into said data in response to said monitored quantity of data for wireless transmission.

7. An apparatus as claimed in claim 6, wherein said code provides an error check.

8. An apparatus as claimed in claim 7, wherein said code comprises a forward error correction code (FEC).

9. An apparatus as claimed in claim 6, wherein said signal generating means includes signal modulating means capable of modulating said signal with data at at least two different data rates, and said controller is arranged to control said modulating means to modulate said signal at a data rate determined according to the monitored quantity of data for wireless transmission.

10. An apparatus as claimed in claim 6, wherein said signal generating means further includes a signal amplifier for amplifying said signal, and said controller is arranged to control the gain and/or power output of said amplifier in response to said monitored quantity of data for wireless transmission.

11. An apparatus as claimed in claim 6, further comprising comparing means for comparing a parameter indicative of the monitored quantity of data for wireless transmission with a predetermined threshold value and wherein said controller is arranged to control said generating means to decrease the data transmission rate in response to said parameter decreasing from a value at or above said predetermined threshold to a value below said predetermined threshold.

12. An apparatus as claimed in claim 11, wherein said controller is arranged to control said modulating means to reduce the modulation rate in response to said parameter falling below said predetermined threshold value.

13. An apparatus as claimed in claim 6, further comprising comparing means for comparing a parameter indicative of the monitored quantity of data for RF transmission with a threshold value and for communicating the result of said comparison to said controller.

14. An apparatus as claimed in claim 13, wherein said controller is arranged to control said generating means to increase the rate of data transmission if said parameter exceeds said threshold value.

15. An apparatus as claimed in claim 14, further including delay means for delaying the response of said controller to said parameter passing above or below said predetermined threshold.

16. An apparatus as claimed in claim 15, wherein said delay means comprises counter means for counting the number of times said parameter passes said predetermined threshold, said controller being arranged not to respond to control said generating means until said number reaches a predetermined value.

17. An apparatus as claimed in claim 13, further comprising request generating means for generating a request to a control station to increase the data transmission rate in response to said monitored quantity of data for wireless transmission, receiving means for receiving a signal indicating whether permission to increase the data transmission rate is granted or denied, wherein said controller controls said generating means in response to the received signal.

18. An apparatus as claimed in claim 13, further comprising request generating means for generating a request to a control station to increase the gain of said amplifier and receiving means for receiving a signal from said control station indicating whether permission to increase said gain is granted or denied, said controller being arranged to control said generating means in response to said received signal.

19. An apparatus as claimed in claim 13, further comprising memory means for storing a parameter indicative of the maximum output power level of the wireless data transmission signal which does not interfere with other wireless transmission signals.

20. A communication system comprising a first fixed-position wireless transmitter and a second fixed-position wireless transmitter, the first transmitter having means to vary the power level of the wireless transmission signal transmitted by said first transmitter, said second transmitter comprising signal generating means for generating a signal for wireless transmission containing data and means to vary the rate at which data is placed onto said signal, communication means for communicating from said first transmitter to said second transmitter a signal indicative of the wireless signal power level from said first transmitter, said second transmitter including means for increasing the data transmission rate output by said second transmitter when the power level of said first transmitter communicated by said communicating means is at a predetermined value.