Sub-packet adaptation in a wireless communication system

• US 7,437,654 B2
• Filed: 11/29/2000
• Issued: 10/14/2008
• Est. Priority Date: 11/29/2000
• Status: Expired due to Fees

• Current Assignee: WSOU Investments, LLC (WSOU Holdings, LLC)
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Nanda, Sanjiv, Das, Arnab, Khan, Farooq Ullah
• Primary Examiner(s): Myers, Paul R
• Application Number:
  US09/725,393
• Publication Number:
  US 20020103953A1
• Time in Patent Office: 2,876 Days
• Field of Search: 370/349, 370/474, 370/342, 375225-228, 714/790
• US Class Current: 714/790
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0006 by adapting the transmission format
• CPC Class Codes: H04L 1/0007 by modifying the frame length
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0016 involving special memory structures, e.g. look-up tables
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0066 Parallel concatenated codes
• CPC Class Codes: H04L 1/0068 by puncturing
• CPC Class Codes: H04L 1/0075 Transmission of coding parameters to receiver H04L1/0023 takes precedence
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1819 with retransmission of additional or different redundancy
• CPC Class Codes: H04L 1/1845 Combining techniques, e.g. code combining

Abstract

Disclosed is a method of sub-packet adaptation based on data rate. Specifically, the size of a sub-packet is adapted to a data rate at which the sub-packet is to be transmitted. In one embodiment, the sub-packet is size adapted to the data rate in a format that would allow such size adapted sub-packet to be soft combined with another sub-packet of a same or different size. The size adapted sub-packet may be transmitted prior to or after the other sub-packet.

Claims

1. A method of transmitting data comprising the steps of:

channel coding an encoder packet to produce a channel coded encoder packet;

puncturing and/or repeating the channel coded encoder packet to produce a first encoder sub-packet having a first size based on a size of the encoder packet and a first data transmission rate at which the first encoder sub-packet is to be transmitted, wherein the first data transmission rate is different from and based on a data rate for transmitting the first encoder sub-packet indicated in a first rate indication message from a receiver, the puncturing including removing bits from the channel coded encoder packet and the repeating including duplicating bits in the channel coded encoder packet;

transmitting the first encoder sub-packet to a receiver;

receiving a NACK message indicating that the transmission of the first encoder sub-packet was not successfully received at the receiver;

puncturing and/or repeating the channel coded encoder packet to produce a second encoder sub-packet having a second size based on a size of the encoder packet and a second data transmission rate at which the second encoder sub-packet is to be transmitted, the second size being different from the first, but the second encoder sub-packet being representative of the same data as the first encoder sub-packet; and

transmitting the second encoder sub-packet to the receiver.

2. The method of claim 1, wherein the first data transmission rate is based on first channel conditions measured at a receiver to which the first encoder sub-packet is intended.

3. The method of claim 1, wherein the first encoder sub-packet has a format which allows the first encoder sub-packet to be soft combined with a second encoder sub-packet derived from the same encoder packet as the first encoder sub-packet.

4. The method of claim 3, wherein the first encoder sub-packet is of a different size than the second encoder sub-packet.

5. The method of claim 3, wherein the first encoder sub-packet is of an identical size than the second encoder sub-packet.

6. The method of claim 1 comprising the additional step of:

adding a first encoder packet size identifier to the first encoder sub-packet indicating the size of the encoder packet from which the first encoder sub-packet was derived.

7. The method of claim 6 comprising the additional step of:

transmitting the first encoder sub-packet with the first encoder packet size identifier at the first data transmission rate.

8. The method of claim 7, wherein the first encoder sub-packet with the first encoder packet size identifier is modulated using a modulation scheme based on the first data transmission rate.

9. The method of claim 7 comprising the additional step of:

prior to the step of transmitting the first encoder sub-packet, transmitting a rate indication message to a receiver to which the first encoder sub-packet is intended indicating the first data transmission rate.

10. The method of claim 1 comprising the additional step of:

adding an encoder sub-packet format identifier to the first encoder sub-packet indicating a first format of the first encoder sub-packet.

11. The method of claim 10, wherein

the first encoder sub-packet is transmitted with the first encoder sub-packet format identifier at the first data transmission rate.

12. The method of claim 11, wherein the first encoder sub-packet with the first encoder sub-packet format identifier is modulated using a modulation scheme based on the first data transmission rate.

13. The method of claim 11 comprising the additional step of:

prior to the step of transmitting the encoder sub-packet, transmitting a first rate indication message to a receiver to which the first encoder sub-packet is intended indicating the first data transmission rate.

14. The method of claim 1 comprising the additional step of:

prior to the step of puncturing and/or repeating the channel coded encoder packet, receiving the first rate indication message from a receiver to which the encoder packet is intended indicating a data rate based on first channel conditions measured at the receiver.

15. The method of claim 14 comprising the additional step of:

transmitting a new rate message to the intended receiver indicating the first data transmission rate.

16. A method of receiving a data transmission comprising the steps of:

receiving at a receiver a message indicating a first data transmission rate;

receiving a first encoder sub-packet with a first encoder packet size identifier indicating a size of the first encoder sub-packet, the first encoder sub-packet being generated by puncturing and/or repeating a channel coded encoder packet, the puncturing including removing bits from the channel coded encoder packet and the repeating including duplicating bits in the channel coded encoder packet;

decoding the first encoder sub-packet using the first encoder packet size identifier and the first data transmission rate, wherein the first data transmission rate is different from and based on a data rate for transmitting the first encoder sub-packet indicated in a first rate indication message from a receiver;

transmitting a negative acknowledgement message and a rate indication message if the first encoder sub-packet cannot be successfully decoded, the rate indication message indicating current channel conditions at the receiver;

receiving a message indicating a second data transmission rate;

receiving a second encoder sub-packet with a second encoder packet size identifier indicating a size of the second encoder sub-packet, the size of the second encoder sub-packet being different from the first, but the second encoder sub-packet being representative of the same data as the first encoder sub-packet; and

decoding the second encoder sub-packet using the second data transmission rate, the second encoder packet size identifier and the first encoder sub-packet.

17. A method of receiving a data transmission comprising the steps of:

receiving at a receiver a message indicating a first data transmission rate;

receiving a first encoder sub-packet with a first encoder sub-packet format identifier indicating a format of the first encoder sub-packet, the first encoder sub-packet being generated by puncturing and/or repeating a channel coded encoder packet, the puncturing including removing bits from the channel coded encoder packet and the repeating including duplicating bits in the channel coded encoder packet;

decoding the first encoder sub-packet using the first encoder sub-packet format identifier and the first data transmission rate, wherein the first data transmission rate is different from and based on a data rate for transmitting the first encoder sub-packet indicated in a first rate indication message from a receiver;

transmitting a negative acknowledgement message and a rate indication message if the first encoder sub-packet can not be successfully decoded, the rate indication message indicating current channel conditions at the receiver;

receiving a message indicating a second data transmission rate;

receiving a second encoder sub-packet with a second encoder sub-packet format identifier encoder sub-packet indicating a format of the second encoder sub-packet, a size of the second encoder sub-packet being different from a size of the first encoder sub-packet, but the second encoder sub-packet being representative of the same data as the first encoder sub-packet; and

decoding the second encoder sub-packet using the second data transmission rate, the second encoder sub-packet format identifier and the first encoder sub-packet.

18. A method of transmitting data comprising the steps of:

channel coding an encoder packet to produce a channel coded encoder packet;

puncturing and/or repeating the channel coded encoder packet to produce a first encoder sub-packet having a first size based on a size of the encoder packet and a first data transmission rate at which the first encoder sub-packet is to be transmitted and including a first encoder packet size identifier to the first encoder sub-packet indicating the size of the encoder packet from which the first encoder sub-packet was derived, wherein the first data transmission rate is different from and based on a data rate for transmitting the first encoder sub-packet indicated in a first rate indication message from a receiver, the puncturing including removing bits from the channel coded encoder packet and the repeating including duplicating bits in the channel coded encoder packet;

transmitting the first encoder sub-packet to a receiver;

receiving a NACK message indicating that the transmission of the first encoder sub-packet was not successfully received at the receiver;

puncturing and/or repeating the channel coded encoder packet to produce a second encoder sub-packet having a second size based on a size of the encoder packet and a second data transmission rate at which the second encoder sub-packet is to be transmitted, the second size being different from the first, but the second encoder sub-packet being representative of the same data as the first encoder sub-packet; and

transmitting the second encoder sub-packet to the receiver.