Out-of-band forward error correction

• US 6,330,700 B1
• Filed: 05/18/1999
• Issued: 12/11/2001
• Est. Priority Date: 05/18/1999
• Status: Expired due to Fees

• Current Assignee: Intel Corporation
• Original Assignee: Omnipoint Corp. (Deutsche Telekom AG)
• Inventors: Barabash, Darrell W., Morris, Russell A.
• Primary Examiner(s): TU, CHRISTINE TRINH LE
• Application Number:
  US09/314,580
• Time in Patent Office: 938 Days
• Field of Search: 714/752, 714/746, 714/748, 714/749, 714/750, 714/751, 714/814, 714/815, 714/821, 714/712, 714/758, 714/701, 714/52, 714/55, 714/56, 370/225
• US Class Current: 714/752
• CPC Class Codes: H03M 13/03 Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence

Abstract

A forward error correction (FEC) method is provided that operates in a multiple access format, such as, e.g., a Time Division Multiple Access (TDMA) format. An FEC transband central station and a plurality of FEC transband remote stations transmit data and corresponding error correction data therebetween during time frames. The time frames are divided into in-band time slots during which the traffic data is transmitted and out-of-band time slots during which the error correction data may be transmitted. The FEC transband remote stations that are assigned to the out-of-band time slots are efficiently and dynamically adjusted during communication.

Claims

1. A method of correcting transmission errors in a communications system:

receiving a bearer data packet from a first logical channel;

receiving an error correction data packet from a second logical channel different from said first logical channel, said error correction data packet corresponding to said bearer data packet;

correcting said bearer data packet with said error correction data packet.

2. The method of claim 1, further comprising:

receiving a plurality of bearer data packets from said first logical channel, said error correction data packet corresponding to said plurality of bearer data packets; and

correcting said plurality of bearer data packets with said error correction data packet.

3. A method of correcting transmission errors in a communications system:

receiving a plurality of bearer data packets during a first time period;

receiving an error correction data packet during a second time period different from said first time period, said error correction data packet corresponding to said plurality of bearer data packets; and

correcting said plurality of bearer data packets with said error correction data packet.

4. A method of correcting transmission errors in a communications system:

dividing each of a plurality of time frames into at least one in-band time slot and at least one out-of-band time slot;

receiving a plurality of bearer data packets during said at least one in-band time slot of said plurality of time frames;

receiving an error correction data packet during a sub-out-of-band time slot, said error correction data packet corresponding to said plurality of bearer data packets; and

correcting said bearer data packets using said error correction data packet.

5. The method of claim 4, wherein said bearer data packet and said error correction data packet are both received during one of said plurality of time frames.

6. The method of claim 4, wherein said bearer data packet is received during one of said plurality of time frames and said error correction data packet is received during another of said plurality of time frames.

7. The method of claim 4, further comprising the step of correcting said plurality of bearer data packets using said error correction data packet.

8. A recordable medium comprising:

a computer program comprising steps for;

receiving a bearer data packet during a first time period;

receiving an error correction data packet during a second time period different from said first time period, said error correction data packet corresponding to said bearer data packet;

correcting said bearer data packet with said error correction data packet.

9. The recordable medium of claim 8, wherein said computer program further comprises steps for receiving a plurality of bearer data packets, wherein said error correction data packet corresponds to said plurality of bearer data packets, and wherein said computer program further comprises a step for correcting said plurality of bearer data packets with said error correction data packet.

10. A recordable medium comprising:

a computer program comprising steps for;

receiving a bearer data packet during an in-band time slot;

receiving an error correction data packet during an out-of-band time slot, said error correction data packet corresponding to said bearer data packet; and

correcting said bearer data packet using said error correction data packet.

11. The recordable medium of claim 10, wherein said computer program further comprises steps for receiving said bearer data packet and said error correction data packet during a single time frame.

12. The recordable medium of claim 10, wherein said computer program further comprises steps for receiving said bearer data packet in a time frame and receiving said error correction data packet in another time frame different from said time frame.

13. The recordable medium of claim 10, wherein said computer program further comprises steps for:

receiving a plurality of bearer data packets respectively during a plurality of time frames, wherein said error correction data packet corresponds to said plurality of bearer data packets; and

correcting said plurality of bearer data packets with said error correction data packet.

14. A communications terminal, comprising:

a receiver;

an error correction decoder electrically coupled to said receiver;

a bearer/FEC data register electrically coupled to said receiver and said error correction decoder; and

a processor electrically coupled to said error correction encoder and said bearer/FEC data register, said processor comprising a computer program comprising steps for;

receiving a bearer data packet during an in-band time slot;

receiving an error correction data packet during an out-of-band time slot, said error correction data packet corresponding to said bearer data packet; and

directing said error correction encoder to correct said bearer data packet using said error correction data packet.

15. The communications terminal of claim 14, wherein said computer program further comprises steps for:

receiving a plurality of bearer data packets respectively during a plurality of time frames, wherein said error correction data packet corresponds to said plurality of bearer data packets;

directing said bearer/FEC data register to store and accumulate said plurality of bearer data packets; and

directing said error correction encoder to correct said plurality of bearer data packets with said error correction data packet.

16. The communications terminal of claim 14, further comprising:

a transmitter;

an error correction encoder electrically coupled to said receiver;

an FEC data register electrically coupled to said receiver and said error correction decoder; and

wherein

said processor electrically coupled to said error correction decoder and said FEC data register, said computer program further comprising steps for;

transmitting another bearer data packet during another in-band time slot;

directing said error correction encoder to generate another error correction data packet from said another bearer data packet; and

transmitting another error correction data packet during another out-of-band time slot, said another error correction data packet corresponding to said another bearer data packet.

17. The communications terminal of claim 15, further comprising:

a transmitter;

an error correction encoder electrically coupled to said receiver;

an FEC data register electrically coupled to said receiver and said error correction decoder; and

wherein

said processor is electrically coupled to said error correction decoder and said FEC data register, said computer program further comprising steps for;

transmitting a plurality of bearer data packets during another in-band time slot over a plurality of time frames;

directing said error correction encoder to generate error correction data from said plurality of bearer data packets;

directing said FEC data register to accumulate and store said error correction data; and

transmitting said error correction data as another error correction data packet during an out-of-band time slot over a single time frame.

18. The communication terminal of claim 17, further comprising an antenna coupled to said receiver and said transmitter.