Wireless communication system

• US 5,258,995 A
• Filed: 11/08/1991
• Issued: 11/02/1993
• Est. Priority Date: 11/08/1991
• Status: Expired due to Term

• Current Assignee: Atmel Corporation (Microchip Technology Incorporated)
• Original Assignee: Teknekron Communications Systems Incorporated
• Inventors: Jarett, Keith, Flores, Christopher, Behtash, Saman, Su, Chun-Meng, Messerschmitt, David G., Lu, Huihung
• Primary Examiner(s): CANGIALOSI, SALVATORE A
• Application Number:
  US07/789,292
• Time in Patent Office: 725 Days
• Field of Search: 375/1, 380/34
• US Class Current: 375/354
• CPC Class Codes: H03M 13/31 combining coding for error detection or correction and efficient use of the spectrum without error detection or correction H03M5/14 , H03M5/145
• CPC Class Codes: H03M 5/145 Conversion to or from block codes or representations thereof
• CPC Class Codes: H04J 1/12 Arrangements for reducing cross-talk between channels in line transmission systems H04B3/32; in cables or lines H04B3/26 - H04B3/30
• CPC Class Codes: H04J 13/16 Code allocation
• CPC Class Codes: H04J 3/0605 Special codes used as synchronising signal
• CPC Class Codes: H04L 25/4908 using mBnB codes
• CPC Class Codes: H04M 1/72502 with one base station connected to a single line

Abstract

In the present invention a wireless communication system is disclosed. A base unit communicates with a remote unit. The system comprises means for transmitting, using CDMA, between the base unit and the remote unit, in one of a plurality of frequencies channels selected. In one period of time, the base unit transmits and in another period of time, different from the one period, the remote unit transmits. Further, the system comprises means for changing the one frequency channel selected to another frequency channel, different from the one frequency channel, in response to interference in the one frequency channel. Thus, communication between the base unit and the remote unit is then affected over the another frequency channel.

Claims

1. A spread spectrum wireless communication system for communicating between a base unit and a remote unit, said system comprising:

means for transmitting using CDMA between the base unit and the remote unit in one of a plurality of frequency channels selected, wherein in one period of time the base unit transmits and in another period of time, different from the one period, the remote unit transmits; and

means for changing the one frequency channel selected to another frequency channel, different from the one frequency channel, in response to interference in the one frequency channel, whereby the communication between the base unit and the remote unit is then effected over said another frequency channel.

2. The system of claim 1 wherein said transmitting means comprises:

means for transmitting a control signal between the base unit and the remote unit during a first portion of said one period and during a first portion of said another period, and for transmitting a data signal between the base unit and the remote unit during a second portion of said one period and during a second portion of said another period.

3. The system of claim 1 wherein said transmitting means further comprises:

means for transmitting a sync signal from the base unit to the remote unit during said one period of time.

4. The system of claim 1 wherein said changing means further comprises:

means, in the base unit, for detecting interference in the signal in the one frequency channel from the remote unit;

means, in the base unit, for transmitting a signaling message to the remote unit to move to another frequency channel; and

means, in the remote unit, to change to another frequency channel.

5. The system of claim 4 wherein said signaling message includes synchronization information.

6. A spread spectrum wireless communication method for communicating between a base unit and a remote unit, said method comprising:

transmitting using CDMA between the base unit and the remote unit, in one of a plurality of frequency channels selected, wherein in one period of time the base unit transmits and in another period of time, different from the one period, the remote unit transmits;

changing the one frequency channel selected to another frequency channel, different from the one frequency channel in response to interference in the one frequency channel, whereby the communication between the base unit and the remote unit is then effected over said another frequency channel.

7. The method of claim 6 wherein a control signal is transmitted during a first portion of said one period and during a first portion of said another period, and a data signal is transmitted during a second portion of said one period and during a second portion of said another period.

8. The method of claim 7 further comprising transmitting a synchronization signal from the base unit to the remote unit during said one period of time.

9. The method of claim 6 wherein said changing step further comprises:

detecting, by the base unit, interference in the signal in the one frequency channel selected, from the remote unit;

transmitting, by the base unit, a signaling message to the remote unit to move to another frequency channel; and

changing, by the remote unit, to another frequency channel.

10. The method of claim 9 wherein the signaling message further comprises synchronization information.

11. A base unit for spread spectrum wireless communication with a remote unit, said base unit comprising:

means for transmitting using CDMA in one of a plurality of frequency channels selected, in one period of time tot he remote unit;

means for receiving using CDMA in said one of a plurality of frequency channels selected, in another period of time, difference from the one period, transmissions from the remote unit; and

means for changing the transmission to another frequency channel in response to interference in the one frequency channel, whereby communication with the remote unit is then effected over said another frequency channel.

12. The base unit of claim 11 wherein said transmitting means further comprising:

means for transmitting a control signal during a first portion of said one period and a data signal encoded by CDMA during a second portion of said one period.

13. The base unit of claim 12 wherein said control signal further comprising:

a sync signal and a common control signal.

14. The base unit of claim 13 wherein said receiving means further comprising:

means for detecting transmission from the remote unit to produce a detected signal; and

means for decoding said detected signal using CDMA to produce a decoded transmitted signal.

15. The base unit of claim 11 wherein said changing means further comprises:

means for detecting interference in the signal in the one frequency channel selected from the remote unit;

means for transmitting a signaling message to the remote unit to move to another frequency channel; and

means for changing to another frequency channel.

16. The base unit of claim 15 wherein said signaling message includes synchronization information.

17. A remote unit for spread spectrum wireless communication with a base unit, said remote unit comprising:

means for transmitting, using CDMA, in one of a plurality of frequency channels selected, in one period of time to the base unit;

means for receiving, using CDMA, in said one of a plurality of frequency channels selected, in another period of time, different from the one period, transmission from the base unit; and

means for changing the transmission to another frequency channel in response to a request from said base unit to change to another frequency in response to interference in said one frequency channel.

18. The remote unit of claim 17 wherein said transmitting means further comprising:

means for transmitting a sync signal during a first portion of said one period and a data signal encoded by CDMA during a second portion of said one period.

19. The remote unit of claim 17 wherein said transmitting means further comprising:

means for receiving a sync signal from the base unit.

20. The remote unit of claim 17 wherein said receiving means further comprising:

means for detecting transmission from the base unit to produce a detected signal; and

means for decoding said detected signal using CDMA to produce a decoded transmitted signal.