Wireless communication method and device with auxiliary receiver for selecting different channels

• US 6,047,175 A
• Filed: 09/19/1996
• Issued: 04/04/2000
• Est. Priority Date: 06/28/1996
• Status: Expired due to Term

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Aironet Wireless Communications, Inc. (Cisco Systems, Inc.)
• Inventors: Trompower, Michael L.
• Primary Examiner(s): Bost, Dwayne D.
• Assistant Examiner(s): SCOTT, LINWOOD
• Application Number:
  US08/715,868
• Time in Patent Office: 1,293 Days
• Field of Search: 455/422, 455/509, 455/436, 455/443, 455/524, 455/412, 455/438, 455/464, 455/450, 455/434, 375/200, 375/202, 370/332
• US Class Current: 455/452.1
• CPC Class Codes: H04W 16/26 Cell enhancers or enhancement, e.g. for tunnels, building shadow
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 88/02 Terminal devices

Abstract

A wireless communication device and method which includes the introduction of a auxiliary receiver or transceiver which is included in a base station or mobile terminal in addition to a transceiver used to communicate between devices. The auxiliary receiver or transceiver serves to monitor conditions on available communication channels other than the channel currently being utilized for communication between devices.

Claims

1. A wireless communication device, comprising:

a transceiver including a transmitter and a receiver for transmitting and receiving wireless communications selectively on any of a plurality of channels; and

an auxiliary receiver for scanning substantially continuously to evaluate one of the plurality of channels while the transceiver communicates on another of the plurality of channels, and for providing information based on communication conditions to the transceiver;

wherein the auxiliary receiver is operatively configured to evaluate the communication conditions by selectively evaluating at least one of different frequency bands, PN code sequences, chipping rates, and modulation complexities.

2. The device of claim 1, wherein the auxiliary receiver selectively evaluates different frequency bands.

3. The device of claim 2, wherein the auxiliary receiver evaluates the different frequency bands by selectively switching between filters having different bandwidths.

4. The device of claim 3, wherein the filters include at least one filter which is broad enough to include at least a portion of two different channels.

5. The device of claim 1, wherein the auxiliary receiver selectively evaluates different PN code sequences.

6. The device of claim 5, wherein the auxiliary receiver comprises a programmable PN decoder for providing different PN code sequences.

7. The device of claim 1, wherein the auxiliary receiver selectively evaluates different chipping rates.

8. The device of claim 7, wherein the auxiliary receiver comprises a programmable PN decoder for providing different chipping rates.

9. The device of claim 1, wherein the auxiliary receiver selectively evaluates different modulation complexities.

10. The device of claim 9, wherein the auxiliary receiver comprises a programmable symbol-to-data converter for providing different modulation schemes.

11. The device of claim 10, wherein the different modulation schemes include BPSK and QPSK.

12. The device of claim 1, wherein the transceiver transmits and receives the wireless communications on a channel selected from among the plurality of channels based on the information provided from the auxiliary receiver.

13. The device of claim 1, wherein the auxiliary receiver evaluates noise conditions on the at least one of the plurality of channels.

14. The device of claim 13, wherein the noise conditions are based on a received signal strength indicator (RSSI) signal obtained by the auxiliary receiver.

15. A base station comprising the device of claim 1, and further including means for connecting the base station to a system backbone in a wireless communication network.

16. In a wireless communication device including a transceiver having a transmitter and a receiver for transmitting and receiving wireless communications on any of a plurality of channels, and an auxiliary receiver, a method for communicating comprising the steps of:

the transceiver communicating on a channel selected from the plurality of channels;

the auxiliary receiver scanning substantially continuously to evaluate communication conditions on each of the plurality of channels while the transceiver communicates on the selected channel, and

selecting another channel for the transceiver to communicate on from among the plurality of channels based on the information provided by the auxiliary receiver,

wherein the auxiliary receiver is operatively configured to evaluate the communication conditions by selectively evaluating at least one of different frequency bands, PN code sequences, chipping rates, and modulation complexities.

17. The method of claim 16, wherein the wireless communication device is a base station used in a cellular communication network.

18. The method of claim 16, wherein the wireless communication device is a mobile terminal used in a cellular communication network.