Wireless Communication Using Customized Digital Enhanced Cordless Telecommunications (DECT) Technology in a Survey Data Acquisition System

• US 20110096628A1
• Filed: 10/26/2009
• Published: 04/28/2011
• Est. Priority Date: 10/26/2009
• Status: Abandoned Application

• Current Assignee: WesternGeco LLC (Schlumberger NV)
• Original Assignee: WesternGeco LLC (Schlumberger NV)
• Inventors: Golparian, Daniel
• Application Number:
  US12/605,625
• Publication Number:
  US 20110096628A1
• Time in Patent Office: Days
• US Class Current: 367/77
• CPC Class Codes: G01V 1/223 Radioseismic systems

Abstract

In a survey data acquisition system that acquires survey data regarding a subterranean structure, information is wirelessly communicated between a wireless survey receiver and a wireless concentrator. Wireless communication of the information uses a wireless protocol that employs slot structures defined by a Digital Enhanced Cordless Telecommunications (DECT) standard.

Claims

1. A method for use with a survey data acquisition system that acquires survey data regarding a subterranean structure, comprising:

wirelessly communicating information between a wireless survey receiver and a wireless concentrator in the survey data acquisition system that acquires survey data regarding the subterranean structure,

wherein wirelessly communicating the information comprises using a wireless protocol that employs slot structures defined by a Digital Enhanced Cordless Telecommunications (DECT) standard.

2. The method of claim 1, wherein the wireless protocol employs time division multiplexing in which a larger number of time slots are assigned for uplink communication from the wireless survey receiver to the wireless concentrator than for downlink communication from the wireless concentrator to the wireless survey receiver.

3. The method of claim 2, wherein the wireless protocol has a medium access control (MAC) layer that is modified from a MAC layer of the DECT standard.

4. The method of claim 3, wherein the wireless protocol employs a data rate per bearer for the MAC layer that is reduced with respect to a data rate specified by the DECT standard such that a number of bearers supported by one radio frequency is increased.

5. The method of claim 1, further comprising wirelessly communicating information between other wireless survey receivers and other wireless concentrators using the wireless protocol,

wherein the wireless concentrators provide respective coverage areas that make up cells to enable a cellular arrangement of wireless communications between the wireless survey receivers and the wireless concentrators.

6. The method of claim 1, wherein wirelessly communicating information between the wireless survey receiver and the wireless concentrator comprises communicating survey data from the wireless survey receiver to the wireless concentrator on a real-time basis.

7. The method of claim 1, wherein wirelessly communicating the information comprises wirelessly communicating the information in a DECT double-slot structure.

8. The method of claim 7, wherein wirelessly communicating the information in the DECT double-slot structure comprises dividing a packet containing survey data into multiple frames, wherein each frame has uplink double slots each according to the DECT double-slot structure, and downlink double slots each according to the DECT double-slot structure.

9. The method of claim 8, wherein the uplink double slots in each frame are used to communicate survey data of respective different survey receivers.

10. The method of claim 8, wherein the downlink double slots are used to communicate control and acknowledgement information from the wireless concentrator.

11. The method of claim 10, wherein the control information is broadcast from the wireless concentrator to multiple survey receivers.

12. The method of claim 1, further comprising the wireless concentrator communicating using a first carrier having a first frequency with a first group of survey receivers in a first sub-coverage area of the wireless concentrator, and communicating using a second carrier having a second, different frequency with a second group of survey receivers in a second sub-coverage area of the wireless concentrator.

13. The method of claim 12, further comprising:

using a frequency reuse pattern in a first row of survey receivers and wireless concentrators, and

using a shifted version of the frequency reuse pattern in a second adjacent row of survey receivers and wireless concentrators.

14. The method of claim 1, further comprising:

communicating backhaul information between the wireless concentrator and a recording station through a communications network that includes a cellular arrangement of base stations.

15. The method of claim 14, wherein communicating the backhaul information through the communications network that includes the cellular arrangement of base stations comprises communicating the backhaul information using WiMAX base stations.

16. The method of claim 15, further comprising:

each of the WiMAX base stations communicating wirelessly with a group of wireless concentrators; and

each of the WiMAX base stations communicating with the recording station.

17. A survey data acquisition system comprising:

wireless survey receivers to receive survey data affected by a subterranean structure; and

at least one wireless concentrator to communicate wirelessly with the wireless survey receivers using a wireless protocol that is based on a Digital Enhanced Cordless Telecommunications (DECT) communications technology

18. The survey data acquisition system of claim 17, wherein the wireless protocol employs time division multiplexing that assigns uplink time slots for uplink communication and downlink time slots for downlink communication, wherein a number of uplink time slots is greater than a number of downlink time slots.

19. The survey data acquisition system of claim 17, further comprising:

a recording station to receive the survey data sent by the wireless survey receivers through the at least one wireless concentrator.

20. The survey data acquisition system of claim 17, further comprising:

a wireless base station that is part of a cellular network to communicate the survey data from the at least one wireless concentrator to the recording station.

21. The survey data acquisition system of claim 20, wherein the wireless base station comprises a WiMAX base station.

22. The survey data acquisition system of claim 17, wherein the wireless concentrator has:

a first DECT chipset and a first directional multi-element antenna subsystem associated with the first DECT chipset to communicate using a first carrier having a first frequency, and

a second DECT chipset and a second directional multi-element antenna system associated with the second DECT chipset to communicate using a second carrier having a second, different frequency.

23. A wireless survey receiver comprising:

a sensor to receive survey data affected by a subterranean structure;

a wireless interface to send the survey data wirelessly to a wireless concentrator, wherein the wireless interface employs a wireless protocol that is based on a Digital Enhanced Cordless Telecommunications (DECT) communications technology.

24. The wireless survey receiver of claim 23, wherein the wireless protocol employs time division multiplexing that assigns uplink time slots for uplink communication and downlink time slots for downlink communication, wherein a number of uplink time slots is greater than a number of downlink time slots.

25. The wireless survey receiver of claim 23, wherein the sensor comprises one of an electromagnetic sensor and a seismic sensor.