Handover processing in multiple access point deployment system

• US 8,320,430 B2
• Filed: 01/20/2012
• Issued: 11/27/2012
• Est. Priority Date: 03/18/2008
• Status: Active Grant

• Current Assignee: Ingenu Inc.
• Original Assignee: On-Ramp Wireless Incorporated
• Inventors: Myers, Theodore J., Sinsuan, Kenneth C., Werner, Daniel Thomas
• Primary Examiner(s): Burd, Kevin M
• Application Number:
  US13/354,846
• Publication Number:
  US 20120113858A1
• Time in Patent Office: 312 Days
• Field of Search: 375/130, 375/140, 375/147, 375/150, 375/295
• US Class Current: 375/150
• CPC Class Codes: H03J 7/02 Automatic frequency control H03J7/18 takes precedence
• CPC Class Codes: H04B 1/7103 the interference being multiple access interference
• CPC Class Codes: H04J 13/00 Code division multiplex systems for frequency hopping H04B1/713
• CPC Class Codes: H04J 13/0029 Gold
• CPC Class Codes: H04J 3/0685 Clock or time synchronisation in a node; Intranode synchronisation
• CPC Class Codes: H04L 1/0038 Blind format detection for detection of modulation format H04L27/0012
• CPC Class Codes: H04L 1/0046 Code rate detection or code type detection H04L1/0038 takes precedence; detection of the data rate H04L25/0262; for packet format H04L1/0091
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 1/0061 Error detection codes
• CPC Class Codes: H04L 1/1819 with retransmission of additional or different redundancy
• CPC Class Codes: H04L 1/1867 Arrangements specially adapted for the transmitter end
• CPC Class Codes: H04L 2027/0065 Frequency error detectors H04L2027/0067 takes precedence
• CPC Class Codes: H04L 27/233 using non-coherent demodulation
• CPC Class Codes: H04L 7/0004 Initialisation of the receiver H04L7/0075 and H04L7/10 take precedence

Abstract

This disclosure relates to method, device and system for determining transmit power in a communication system. A node receives an access point interference signal from an access point. The access point interference signal is measured by the access point based in part on an inference from an external system. The node determines a transmit power based in part on the access point interference signal. The node then transmits an uplink signal at the transmit power.

Claims

1. A method of determining transmit power in a communication system, the method comprising:

receiving an access point interference signal from a transmitter wherein the access point interference signal is based in part on an interference from an external system;

determining a transmit power based in part on the access point interference signal; and

transmitting an uplink signal from a node at the transmit power, wherein the uplink signal is transmitted at a first time based on a slot start time and a first random timing offset, wherein the uplink signal is transmitted while at least a portion of a second signal is transmitted from a second node such that both the uplink signal and the second signal are received, and wherein the second signal is transmitted at a second time based on the slot time and a second random timing offset.

2. The method of claim 1, wherein the access point interference signal is based in part on an effective noise measurement and a background noise measurement.

3. The method of claim 2, wherein the effective noise measurement is based on a plurality of average power measurements that are measured while no transmission is received.

4. The method of claim 2, wherein the effective noise measurement is based on a signal-to-noise ratio and a plurality of average power measurements that are measured while a transmission is received.

5. The method of claim 2, wherein the background noise measurement is determined during calibration.

6. The method of claim 2, wherein the access point interference signal is based in part on a margin for channel fading.

7. The method of claim 1, further comprising measuring a signal power of a downlink signal received at the node from the transmitter, wherein the transmit power is determined in part from the signal power.

8. The method of claim 7, wherein the downlink signal is spread and wherein the downlink signal is received with an interfering signal.

9. The method of claim 1, further comprising measuring a signal power of a downlink signal received at the node from the transmitter, wherein the uplink signal is transmitted to an access point chosen based in part on the signal power and the access point interference signal.

10. A node comprising:

a processor;

a receiver operatively coupled to the processor and configured to;

receive an access point interference signal from a downlink transmitter wherein the access point interference signal is based in part on an interference from an external system; and

a transmitter operatively coupled to the processor and configured to;

transmit an uplink signal from the node at a transmit power based in part on the access point interference signal, wherein the uplink signal is transmitted at a first time based on a slot start time and a first random timing offset, wherein the uplink signal is transmitted while at least a portion of a second signal is transmitted from a second node such that both the uplink signal and the second signal are received, and wherein the second signal is transmitted at a second time based on the slot time and a second random timing offset.

11. The node of claim 10, wherein the access point interference signal is based in part on an effective noise measurement and a background noise measurement.

12. The node of claim 10, wherein the receiver is further configured to measure a signal power of a downlink signal received from the downlink transmitter, and wherein the transmit power is determined in part from the signal power.

13. The node of claim 12, wherein the downlink signal is spread and wherein the downlink signal is received with an interfering signal.

14. The node of claim 10, wherein the uplink signal is transmitted to an access point chosen based in part on a signal power of a downlink signal received at the node from the downlink transmitter and the access point interference signal.

15. A system comprising:

an access point comprising a downlink transmitter; and

a node comprising;

a processor;

a receiver operatively coupled to the processor and configured to;

receive an access point interference signal from the downlink transmitter wherein the access point interference signal is based in part on an interference from an external system; and

a transmitter operatively coupled to the processor and configured to;

transmit an uplink signal from the node to the access point at a transmit power based in part on the access point interference signal, wherein the uplink signal is transmitted at a first time based on a slot start time and a first random timing offset, wherein the uplink signal is transmitted while at least a portion of a second signal is transmitted from a second node such that both the uplink signal and the second signal are received, and wherein the second signal is transmitted at a second time based on the slot time and a second random timing offset.

16. The system of claim 15, wherein the access point interference signal is based in part on an effective noise measurement and a background noise measurement.

17. The system of claim 15, wherein the receiver is further configured to measure a signal power of a downlink signal received from the downlink transmitter, and wherein the transmit power is determined in part from the signal power.

18. The system of claim 17, wherein the downlink signal is spread and wherein the downlink signal is received with an interfering signal.

19. The system of claim 15, wherein the uplink signal is transmitted to the access point chosen based in part on a signal power of a downlink signal received at the node from the downlink transmitter and the access point interference signal.

20. The system of claim 16, wherein the access point interference signal is based in part on a margin for channel fading.