Apparatus and method for transmitting and receiving wireless packet data

• US 20070133579A1
• Filed: 12/12/2006
• Published: 06/14/2007
• Est. Priority Date: 12/12/2005
• Status: Active Grant

• Current Assignee: International Semiconductor Group
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Noh-Sun
• Granted Patent: US 7,813,379 B2
• Time in Patent Office: Days
• US Class Current: 370/403
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365

Abstract

An apparatus and method for transmitting and receiving wireless packet data are provided. In a wireless packet data transmitter for transmitting to a wireless packet data receiver data packet on a transport channel and control information for supporting the transport channel on a control channel in a wireless packet data communications system, a padding bit eliminator eliminates optional padding bits of a variable size from a transport block for data packet transmission. A transport channel encoder for transport channel-encodes the transport block without the padding bits and transmits the encoded transport block on the transport channel. A control channel encoder control channel-encodes the control information including a padding bit number indicator indicating the number of the eliminated padding bits and transmits the encoded control information on the control channel.

Claims

1. A wireless packet data transmitter for transmitting to a wireless packet data receiver data packet on a transport channel and control information for supporting the transport channel on a control channel in a wireless packet data communications system, comprising:

a padding bit eliminator for eliminating optional padding bits of a variable size from a transport block for data packet transmission;

a transport channel encoder for transport channel-encoding the transport block without the padding bits and transmitting the encoded transport block on the transport channel; and

a control channel encoder for control channel-encoding the control information including a padding bit number indicator indicating the number of the eliminated padding bits and transmitting the encoded control information on the control channel.

2. The wireless packet data transmitter of claim 1, wherein the wireless packet data communications system is a high speed downlink packet access (HSDPA) system, the transport channel is a high speed physical downlink shared channel (HS-PDSCH), and the control channel is a high speed shared control channel (HS-SCCH).

3. The wireless packet data transmitter of claim 2, wherein if the transport block is an initial transmission block carrying a new data packet, the control channel encoder transmits the padding bit indicator in a redundancy and constellation version (RV) field, and if the transport block is a retransmission block carrying a retransmission data packet, the control channel encoder selects one of predetermined RV coding values and transmits the selected RV coding value in the RV field.

4. The wireless packet data transmitter of claim 3, wherein an RV coding value preset between the wireless packet data transmitter and the wireless packet data receiver among the RV coding values is selected as a default at initial transmission.

5. The wireless packet data transmitter of claim 4, wherein the RV coding value selected as the default is 0.

6. The wireless packet data transmitter of claim 1, wherein the transport channel encoding includes rate matching and channel encoding.

7. A method of transmitting to a wireless packet data receiver data packet on a transport channel and control information for supporting the transport channel on a control channel in a wireless packet data communications system, comprising the steps of:

eliminating optional padding bits of a variable size from a transport block for data packet transmission;

transport channel-encoding the transport block without the padding bits and transmitting the encoded transport block on the transport channel; and

control channel-encoding the control information including a padding bit number indicator indicating the number of the eliminated padding bits and transmitting the encoded control information on the control channel.

8. The method of claim 7, wherein the wireless packet data communications system is a high speed downlink packet access (HSDPA) system, the transport channel is a high speed physical downlink shared channel (HS-PDSCH), and the control channel is a high speed shared control channel (HS-SCCH).

9. The method of claim 8, wherein the control channel encoding step comprises:

transmitting the padding bit indicator in a redundancy and constellation version (RV) field, if the transport block is an initial transmission block carrying a new data packet; and

selecting one of predetermined RV coding values and transmitting the selected RV coding value in the RV field, if the transport block is a retransmission block carrying a retransmission data packet.

10. The method of claim 9, wherein a predetermined RV coding value among the RV coding values is selected as a default at the initial transmission.

11. The method of claim 10, wherein the RV coding value selected as the default is 0.

12. The method of claim 7, wherein the transport channel encoding step comprises transport channel-encoding the transport block without the padding bits through rate matching and channel encoding.

13. A wireless packet data receiver for receiving from a wireless packet data receiver data packet on a transport channel and control information for supporting the transport channel on a control channel in a wireless packet data communications system, comprising:

a control channel decoder for receiving control channel-encoded control information on the control channel and control channel-decoding the control information;

a control information interpreter for correcting transport block size information included in the control channel-decoded control information based on a padding bit number indicator included in the control channel-decoded control information; and

a transport channel decoder for receiving a transport channel-encoded transport block without padding bits on the transport channel and transport channel-decoding the transport block without the padding bits according to the corrected transport block size.

14. The wireless packet data receiver of claim 13, wherein the wireless packet data communications system is a high speed downlink packet access (HSDPA) system, the transport channel is a high speed physical downlink shared channel (HS-PDSCH), and the control channel is a high speed shared control channel (HS-SCCH).

15. The wireless packet data receiver of claim 14, wherein if the transport block is an initial transmission block carrying a new data packet, the padding bit indicator is received in a redundancy and constellation version (RV) field, and if the transport block is a retransmission block carrying a retransmission data packet, a selected one of predetermined RV coding values is received in the RV field.

16. The wireless packet data receiver of claim 15, wherein it is agreed between the wireless packet data transmitter and the wireless packet data receiver that a predetermined RV coding value among the RV coding values is selected as a default at the initial transmission.

17. The wireless packet data receiver of claim 16, wherein the RV coding value selected as the default is 0.

18. The wireless packet data receiver of claim 13, wherein the transport channel decoding includes de-rate matching and channel decoding.

19. A method of receiving from a wireless packet data receiver data packet on a transport channel and control information for supporting the transport channel on a control channel in a wireless packet data communications system, comprising the steps of:

receiving control channel-encoded control information on the control channel and control channel-decoding the control information;

correcting transport block size information included in the control channel-decoded control information based on a padding bit number indicator included in the control channel-decoded control information; and

receiving a transport channel-encoded transport block without padding bits on the transport channel and transport channel-decoding the transport block without the padding bits according to the corrected transport block size.

20. The method of claim 19, wherein the wireless packet data communications system is a high speed downlink packet access (HSDPA) system, the transport channel is a high speed physical downlink shared channel (HS-PDSCH), and the control channel is a high speed shared control channel (HS-SCCH).

21. The method of claim 20, wherein the control information receiving step comprises:

receiving the padding bit indicator in a redundancy and constellation version (RV) field, if the transport block is an initial transmission block carrying a new data packet; and

receiving a selected one of predetermined RV coding values in the RV field, if the transport block is a retransmission block carrying a retransmission data packet.

22. The method of claim 21, wherein it is agreed between the wireless packet data transmitter and a wireless packet data receiver that a predetermined RV coding value among the RV coding values is selected as a default at the initial transmission.

23. The method of claim 22, wherein the RV coding value selected as the default is 0.

24. The method of claim 19, wherein the transport channel decoding step comprises transport channel-decoding the transport block without the padding bits according to the corrected transport block size through de-rate matching and channel decoding.