User data broadcast mechanism

• US 8,290,023 B2
• Filed: 09/14/2011
• Issued: 10/16/2012
• Est. Priority Date: 03/18/2008
• Status: Active Grant

• Current Assignee: Ingenu Inc.
• Original Assignee: On-Ramp Wireless Incorporated
• Inventors: Myers, Theodore J., Boesel, Robert W.
• Primary Examiner(s): Burd, Kevin M
• Application Number:
  US13/232,426
• Publication Number:
  US 20110320908A1
• Time in Patent Office: 398 Days
• Field of Search: 375/130, 375/140, 375/146, 375/295
• US Class Current: 375/146
• 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 detecting errors in a communication system. A signal is received from a transmitter at a receiver wherein the signal includes a data portion and a result of a hash function. The hash function is computed in part from a transmitter identification code. The receiver determines if the result of the hash function matches both the data portion and the transmitter identification code. The receiver discards the signal if the result of the hash function does not match both the data portion and the transmitter identification code of the transmitter.

Claims

1. A method of compensating for information not received in a communication system, the method comprising:

creating an encoded signal at a transmitter from a source signal using a forward error correction technique, wherein the encoded signal is identical to a second encoded signal created at a second transmitter;

splitting the encoded signal into a plurality of units;

spreading a first unit of the plurality of units;

transmitting the first unit of the plurality of units to a first receiver and a second receiver; and

determining whether the first unit of the plurality of units should be transmitted based in part on a first received acknowledgement message from the first receiver and a second received acknowledgement message from the second receiver, wherein the first received acknowledgement message is received at a first time based on a slot start time and a first random timing offset, wherein the first received acknowledgement message is received while at least a portion of a second signal is received from a second node, and wherein the second signal is received at a second time based upon the slot start time and a second random timing offset.

2. The method of claim 1, further comprising determining whether the first unit of the plurality of units should be transmitted based in part on a predetermined number of units that should be transmitted.

3. The method of claim 2, wherein the predetermined number of units is a minimum number of units needed to decode the source signal.

4. The method of claim 2, wherein the predetermined number of units is a worst-case number of units needed for a receiver with a worst-case link to decode the source signal.

5. The method of claim 2, wherein the predetermined number of units is adjusted based on a feedback signal from the first receiver.

6. The method of claim 1, wherein the forward error correction technique uses a plurality of systematic symbols and a plurality of parity symbols.

7. The method of claim 1, wherein the forward error correction technique comprises a Reed Solomon encoding technique.

8. The method of claim 1, wherein the source signal is a component of a code load.

9. An access point comprising:

a processor configured to;

create an encoded signal from a source signal using a forward error correction technique, wherein the encoded signal is identical to a second encoded signal created at a second access point; and

split the encoded signal into a plurality of units; and

a transmitter operatively coupled to the processor and configured to;

spread a first unit of the plurality of units; and

transmit the first unit of the plurality of units to a first receiver and a second receiver; and

wherein the processor is further configured to determine whether the first unit of the plurality of units should be transmitted based in part on a first received acknowledgement message from the first receiver and a second received acknowledgement message from the second receiver, wherein the first received acknowledgement message is received at a first time based on a slot start time and a first random timing offset, wherein the first received acknowledgement message is received while at least a portion of a second signal is received from a second node, and wherein the second signal is received at a second time based upon the slot start time and a second random timing offset.

10. The access point of claim 9, wherein the processor is further configured to determine whether the first unit of the plurality of units should be transmitted based in part on a predetermined number of units that should be transmitted.

11. The access point of claim 10, wherein the predetermined number of units that should be transmitted is a minimum number of units needed to decode the source signal.

12. The access point of claim 9, wherein the forward error correction technique comprises a Reed Solomon encoding technique.