Method of accommodating overlapping or adjacent networks

• US 20030199279A1
• Filed: 03/06/2003
• Published: 10/23/2003
• Est. Priority Date: 03/06/2002
• Status: Active Grant

• Current Assignee: North Star Innovations Inc. (Wi-LAN Inc.)
• Original Assignee: Freescale Semiconductor, Inc. (NXP Semiconductors NV)
• Inventors: Roberts, Richard D.
• Granted Patent: US 7,333,814 B2
• Time in Patent Office: Days
• US Class Current: 455/452.2
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/16 in which the return channel carries supervisory signals, e.g. repetition request signals

Abstract

A multiple step process is performed at a local wireless network to limit interference between the local wireless network and a remote wireless network. Initially, a set of code words is chosen for the local wireless network to encode data with that have good cross correlation properties. If these initial code words are not adequate to prevent interference, then the local wireless network will adjust its transmission parameters by either shifting the transmission phase of its signals or by changing the code words it uses. If altering the transmission parameters does not alleviate the interference problem, then the local wireless network attempts to locate the interfering remote network and merge with it. If the merger is not possible or is unsuccessful, then the interference limiting process fails.

Claims

1. A method of limiting interference in a local wireless network, comprising:

transmitting a first wireless signal within the local wireless network using a first set of transmission parameters;

performing a first signal analysis to determine whether the signal quality of the first wireless signal is above a quality threshold;

adjusting the first set of transmission parameters in the local wireless network to a second set of transmission parameters if the signal quality is below the quality threshold;

transmitting a second wireless signal within the local wireless network using the first set of transmission parameters if the signal quality is determined to be above the quality threshold in the step of performing a first signal analysis; and

transmitting a second wireless signal within the local wireless network using the second set of transmission parameters if the signal quality is determined to be below the quality threshold in the step of performing a first signal analysis.

2. A method of limiting interference in a local wireless network, as recited in claim 1,

wherein the first transmission parameters include a first transmission phase and a first set of code words used to encode data,

wherein the second transmission parameters include a second transmission phase and a second set of code words used to encode data, and

wherein the second transmission phase is different from the first transmission phase and the second set of code words is the same as the first set of code words.

3. A method of limiting interference in a local wireless network, as recited in claim 2, wherein a difference between the second transmission phase and the first transmission phase is determined in a random manner.

4. A method of limiting interference in a local wireless network, as recited in claim 2, wherein the first set of code words has cross correlation parameters such that correlation between any two of the first set of code words produces a first correlation value greater than an expected correlation value between two random code words.

5. A method of limiting interference in a local wireless network, as recited in claim 1,

wherein the first transmission parameters include a first transmission phase and a first set of code words used to encode data,

wherein the second transmission parameters include a second transmission phase and a second set of code words used to encode data, and

wherein the second transmission phase is the same as the first transmission phase and the second set of code words is different from the first set of code words.

6. A method of limiting interference in a local wireless network, as recited in claim 5,

wherein the first set of code words has first cross correlation parameters such that correlation between any two of the first set of code words produces a first correlation value greater than an expected correlation value between two random code words, and

wherein the second set of code words has second cross correlation parameters such that correlation between any two of the second set of code words produces a second correlation value greater than the expected correlation value between two random code words.

7. A method of limiting interference in a local wireless network, as recited in claim 1,

wherein the first transmission parameters include a first transmission phase and a first set of code words used to encode data, wherein the second transmission parameters include a second transmission phase and a second set of code words used to encode data, and

wherein the second transmission phase is different from the first transmission phase and the second set of code words is different from the first set of code words.

8. A method of limiting interference in a local wireless network, as recited in claim 7, wherein a difference between the second transmission phase and the first transmission phase is determined in a random manner.

9. A method of limiting interference in a local wireless network, as recited in claim 7,

wherein the first set of code words has first cross correlation parameters such that correlation between any two of the first set of code words produces a first correlation value greater than an expected correlation value between two random code words, and

wherein the second set of code words has second cross correlation parameters such that correlation between any two of the second set of code words produces a second correlation value greater than the expected correlation value between two random code words.

10. A method of limiting interference in a local wireless network, as recited in claim 1, further comprising:

performing a second signal analysis to determine whether the signal quality of the second wireless signal is above the quality threshold;

detecting whether a remote wireless network is in proximity with the local wireless network if the signal quality is below the quality threshold;

determining whether a merger of the local wireless network and the remote wireless network is acceptable, if the remote wireless network is detected; and

merging the local wireless network with the interfering wireless network if the determining step shows that the merger is acceptable.

11. A method of limiting interference in a local wireless network, as recited in claim 10, further comprising performing an error handling procedure if either detecting step does not detect the remote wireless network or the determining step shows that the merger is not acceptable.