Transport block set segmentation

• US 20050047346A1
• Filed: 05/07/2004
• Published: 03/03/2005
• Est. Priority Date: 02/13/2002
• Status: Active Grant

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Terry, Stephen E., Zeira, Ariela, Bolourchi, Nader
• Granted Patent: US 8,233,501 B2
• Time in Patent Office: Days
• US Class Current: 370/236
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0006 by adapting the transmission format
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• 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
• CPC Class Codes: H04L 1/1874 Buffer management

Abstract

Data of a transport block set is to be transmitted in a wireless communication system. The wireless communication system uses adaptive modulation and coding and has a physical layer hybrid automatic repeat request mechanism. Segmentation information for potential segmentation of the transport block set is provided. The transport block set is transmitted with a first specified modulation and coding scheme. The transport bock set is received and whether the received transport block set is determined to meet a specified quality. When the specified quality is not met, a repeat request is transmitted. The first specified modulation and coding set is changed to a second specified modulation and coding set. In response to the repeat request, the transmit block set is segmented into a plurality of segments supported by the second specified modulation and coding set in accordance with the provided segmentation information. The segments are transmitted and at least two of the segments are transmitted separately. The transmitted segments are received. The segmentation process may be applied more than once for a particular TBS transmission.

Claims

1. A method for transmitting data of a transport block set in a wireless communication system using adaptive modulation and coding and having a physical layer hybrid automatic repeat request mechanism, the method comprising:

providing segmentation information for potential segmentation of the transport block set;

transmitting the transport block set with a first specified modulation and coding scheme;

receiving the transport block set and determining whether the received transport block set meets a specified quality;

when the first specified quality is not met, transmitting a repeat request;

changing the specified modulation and coding set to a second specified modulation and coding set;

in response to the repeat request, segmenting the transmit block set into a plurality of segments in accordance with the provided segmentation information;

transmitting the segments, at least two of the segments are transmitted separately; and

receiving the transmitted segments.

2. The method of claim 1 further comprising performing a quality test on each transmitted segment.

3. The method of claim 2 further comprising if one of the segments fails the quality test, that segment is retransmitted.

4. The method of claim 1 wherein a control message comprises the segmentation information and the control message is sent separate from the segments.

5. The method of claim 1 wherein the segmentation information is a segmentation indicator for each segment.

6. The method of claim 1 wherein the segmentation information is a transmission sequence number for each segment.

7. The method of claim 1 wherein the providing segmentation information is only selectively provided.

8. The method of claim 6 wherein a segmentation decision device determines whether to provide the segmentation information.

9. A transmitter for transmitting data of a transport block set using adaptive modulation and coding and having a physical layer hybrid automatic repeat request mechanism, the transmitter comprising:

a transmitter for transmitting the transport block set with a first specified modulation and coding scheme and capable of transmitting segments of the transport block set, at least two of the segments being transmitted separately;

an automatic repeat request receiver for receiving a repeat request;

an adaptive modulation and coding controller for changing the specified modulation and coding set to a second specified modulation and coding set; and

a segmentation device in response to receiving a repeat request and the change to the second specified modulation and coding set, for segmenting the transmit block set into a plurality of segments in accordance with segmentation information for transmission by the transmitter.

10. The transmitter of claim 9 wherein the transmitter sends a control message comprising the segmentation information and the control message is sent separate from the segments.

11. The transmitter of claim 9 wherein the segmentation information is a segmentation indicator for each segment.

12. The transmitter of claim 9 wherein the segmentation information is a transmission sequence number for each segment.

13. The transmitter of claim 9 further comprising a segmentation decision device for determining whether to support segmentation by requesting segmentation information.

14. A transmitter for transmitting data of a transport block set using adaptive modulation and coding and having a physical layer hybrid automatic repeat request mechanism, the transmitter comprising:

means for transmitting the transport block set with a first specified modulation and coding scheme and capable of transmitting segments of the transport block set, at least two of the segments being transmitted separately;

means for receiving a repeat request;

means for changing the specified modulation and coding set to a second specified modulation and coding set;

means for receiving a repeat request and the change to the second specified modulation and coding set; and

means for segmenting the transmit block set into a plurality of segments in accordance with segmentation information for transmission by the transmitter.

15. The transmitter of claim 14 wherein the transmitter sends a control message comprising the segmentation information and the control message is sent separate from the segments.

16. The transmitter claim 14 wherein the segmentation information is a segmentation indicator for each segment.

17. The transmitter of claim 14 wherein the segmentation information is a transmission sequence number for each segment.

18. The transmitter of claim 14 further comprising means for determining whether to support segmentation by requesting segmentation information.

19. A user equipment for receiving data of a transport block set in a wireless communication system using adaptive modulation and coding and having a physical layer hybrid automatic repeat request mechanism, the user equipment comprising:

a receiver for receiving a transport block set and determining whether the received transport block set meets a specified quality and for receiving segments of the transport block set in subsequent transmissions, the segments transmitted using a different modulation and coding set than the transport block set and at least two of the segments transmitted separately;

a hybrid automatic repeat request decoder for determining whether each received transport block set and segment meets a specified quality; and

an automatic repeat request transmitter for transmitting a repeat request when the transport block set or segments do not meet the specified quality.

20. A user equipment for receiving data of a transport block set in a wireless communication system using adaptive modulation and coding and having a physical layer hybrid automatic repeat request mechanism, the user equipment comprising:

means for receiving a transport block set and determining whether the received transport block set meets a specified quality;

means for receiving segments of the transport block set in subsequent transmissions, the segments transmitted using a different modulation and coding set than the transport block set and at least two of the segments transmitted separately;

means for determining whether each received transport block set and segment meets a specified quality; and

means for transmitting a repeat request when the transport block set or segments do not meet the specified quality.

21. A method for transmitting data of a transport block set in a wireless communication system using adaptive modulation and coding and having physical layer hybrid automatic repeat request mechanism, the method comprising:

selectively supporting segmentation of a transport block set;

if supporting segmentation is not selected, transmitting the transport block set using the physical layer hybrid automatic repeat request mechanism;

if supporting segmentation is selected;

appending segmentation information to the transport block set; and

selectively segmenting the transport block set prior to transmission using the physical layer hybrid automatic repeat request mechanism using the appended segmentation information.

22. The method of claim 21 wherein the selectively supporting is decided based on a cell loading.

23. The method of claim 21 wherein the selectively supporting is decided based on added users.

24. The method of claim 21 wherein the selectively supporting is decided based on a number of hybrid automatic repeat request retransmissions.

25. The method of claim 21 wherein the selectively supporting is decided based on a measured channel quality.

26. A transmitter for transmitting data of a transport block set in a wireless communication system using adaptive modulation and coding and having physical layer hybrid automatic repeat request mechanism, the transmitter comprising:

a segmentation decision device for determining whether segmentation information is needed;

if segmentation information is needed, sending a signal; and

a segmentation device for selectively segmenting the transport block set prior to transmission using the physical layer hybrid automatic repeat request mechanism using appended segmentation information as requested by the signal.

27. The transmitter of claim 26 wherein the determining is based on a cell loading.

28. The transmitter of claim 26 wherein the determining is based on added users.

29. The transmitter of claim 26 wherein the determining is based on a number of hybrid automatic repeat request retransmissions.

30. The transmitter of claim 26 wherein the determining is based on a measured channel quality.