Wireless network discovery and path optimization algorithm and system

Patent metadata

Field	Value
Publication number	US-9686021-B2
Application number	US-201113075582-A
Country	US
Kind code	B2
Filing date	Mar 30, 2011
Priority date	Mar 30, 2011
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

Abstract

A wireless modem for communication in a network of wireless modems via a communication channel includes a transceiver assembly, transceiver electronics and a power supply. The transceiver electronics include transmitter electronics, receiver electronics and at least one processing unit. The transmitter electronics cause the transceiver assembly to send wireless signals into the communication channel. The receiver electronics decode signals received by the transceiver assembly. The at least one processing unit executes instructions to (1) enable the transmitter electronics to transmit the wireless signals into the communication channel to at least two wireless modems in a first direction away from the transceiver assembly, (2) receive a signal from at least one of the wireless modems, (3) assign a quality parameter to the signals received from the other wireless modems, and (4) select one of the wireless modems to communicate with based on an examination of the quality parameters with at least one predetermined criterion. The power supply supplies power to the transceiver assembly and the transceiver electronics.

First claim

The invention claimed is:

1. A wireless modem for communication in a network of wireless modems via a communication channel, the wireless modem comprising:
a transceiver assembly;
transceiver electronics, comprising:
transmitter electronics to cause the transceiver assembly to send wireless signals into the communication channel;
receiver electronics to decode signals received by the transceiver assembly;
at least one processing unit executing instructions to (1) enable the transmitter electronics to transmit the wireless signals into the communication channel to at least two wireless modems in a first direction away from the transceiver assembly, wherein one of the two wireless modems is communicatively coupled intermediate the transceiver assembly and the other of the two wireless modems, (2) determine a characteristic of signals received at the transceiver electronics from the at least two wireless modems in response to the transmitted wireless signals, (3) assign a quality parameter to the signals received from the at least two wireless modems based on the determined characteristic, and (4) determine whether the intermediate wireless modem can be skipped based on a comparison of the quality parameters assigned to the received signals with at least one predetermined criterion and select one of the at least two wireless modems to directly communicate with based on the result of the determination; and

a power supply supplying power to the transceiver assembly and the transceiver electronics.

2. The wireless modem of claim 1 , wherein the wireless signals sent into the communication channel comprise a variable signal frequency and a variable signal bitrate cooperating to define a transmission pair for the wireless signals.

3. The wireless modem of claim 1 , wherein the at least one processing unit executing instructions to further (5) enable the transmitter and receiver electronics to subsequently communicate with the selected wireless modem.

4. The wireless modem of claim 3 , wherein the selected wireless modem is characterized as at least a two hop modem, such that the selected wireless modem has at least one other modem in between the wireless modem and the selected wireless modem.

5. The wireless modem of claim 4 , wherein the at least one processing unit enables the transmitter electronics and the receiver electronics to communicate with the selected wireless modem by using a selected transmission pair based on the quality parameter assigned to the signal received from the selected wireless modem.

6. The wireless modem of claim 1 , wherein one of the wireless modems is a first wireless modem, and another one of the wireless modems is a second wireless modem, and wherein the at least one processing unit executes instructions to enable the receiver electronics to receive the signal from first wireless modem on a first predetermined time slot and to receive the signal from the second wireless modem on a second predetermined time slot such that the signals are received at different times.

7. The wireless modem of claim 1 , wherein one of the wireless modems is a first wireless modem, and another one of the wireless modems is a second wireless modem, and wherein the at least one processing unit executes instructions to enable the receiver electronics to receive the signals from the first and second wireless modems on variable time slots.

8. The wireless modem of claim 1 , wherein the determined characteristic of the signals received at the transceiver electronics is a signal-to-noise ratio, a signal-to interference-noise ratio, an intersymbol interference measure, or a distortion level.

9. An acoustic modem for communication in a network of acoustic modems via a tubing string positionable in a wellbore, the acoustic modem comprising:
a transceiver assembly;
transceiver electronics, comprising:
transmitter electronics to cause the transceiver assembly to send acoustic signals which define one or more transmission pairs into the tubing string, wherein each transmission pair has different transmission characteristics comprising a combination of a signal frequency and a signal bitrate;
receiver electronics to decode signals received by the transceiver assembly;
at least one processing unit executing instructions to (1) enable the transmitter electronics to transmit the acoustic signals into the tubing string to at least two acoustic modems in a first direction away from the transceiver assembly, wherein one of the two acoustic modems is communicatively coupled along the tubing string intermediate the transceiver assembly and the other of the two acoustic modems, (2) determine a characteristic of acoustic signals received at the transceiver electronics from the at least two acoustic modems in response to the transmitted acoustic signals, (3) assign a quality parameter to the acoustic signals received from the at least two acoustic modems based on the determined characteristic, and (4) determine whether the intermediate acoustic modem can be skipped based on a comparison of the quality parameters assigned to the received signals with at least one predetermined criterion and select one of the at least two acoustic modems to directly communicate with based on the determination; and

a power supply supplying power to the transceiver assembly and the transceiver electronics.

10. The acoustic modem of claim 9 , wherein the acoustic signals sent into the communication channel comprise a variable signal frequency and a variable signal bitrate cooperating to define a transmission pair for the acoustic signals.

11. The acoustic modem of claim 9 , wherein the selected acoustic modem is at least a two hop acoustic modem, such that the selected acoustic modem has at least one other modem in between the acoustic modem and the selected acoustic modem.

12. The acoustic modem of claim 11 , wherein the at least one processing unit enables the transmitter electronics and the receiver electronics to communicate with the selected acoustic modem by using a selected transmission pair based on the quality parameter assigned to the acoustic signal received from the selected acoustic modem.

13. The acoustic modem of claim 9 , wherein one of the acoustic modems is a first acoustic modem, and another one of the acoustic modems is a second acoustic modem, and wherein the at least one processing unit executes instructions to enable the receiver electronics to receive the acoustic signal from the first acoustic modem on a first predetermined time slot and to receive the acoustic signal from the second acoustic modem on a second predetermined time slot such that the acoustic signals are received at different times.

14. The acoustic modem of claim 9 , wherein one of the acoustic modems is a first acoustic modem, and another one of the acoustic modems is a second acoustic modem, and wherein the at least one processing unit executes instructions to enable the receiver electronics to receive the acoustic signals from the first and second acoustic modems on variable time slots.

15. The acoustic modem of claim 9 , wherein the determined characteristic of the signals received at the transceiver electronics is a signal-to-noise ratio, a signal-to interference-noise ratio, an intersymbol interference measure, or a distortion level.

16. A method for determining a path to communicate using wireless modems in a downhole environment, comprising:
coupling a plurality of wireless modems to an elongated member extending from within a borehole to a surface location so that the wireless modems are communicatively coupled in a series; and
enabling a fir

Assignees

• Merino Carlos
• Schlumberger Technology Corp

Inventors

• Merino Carlos

Classifications

• E21B47/13

  by electromagnetic energy, e.g. radio frequency · CPC title

• H04W40/12

  based on transmission quality or channel quality · CPC title

• H04W84/18

  Self-organising networks, e.g. ad-hoc networks or sensor networks · CPC title

• H04B11/00 Primary

  Transmission systems employing ultrasonic, sonic or infrasonic waves · CPC title

• E21B47/16

  through the drill string or casing {, e.g. by torsional acoustic waves} · CPC title