Broadcast message segmentation for wireless communication systems

• US 20040027999A1
• Filed: 08/08/2002
• Published: 02/12/2004
• Est. Priority Date: 08/08/2002
• Status: Abandoned Application

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Casaccia, Lorenzo, Sinnarajah, Ragulan
• Application Number:
  US10/215,967
• Publication Number:
  US 20040027999A1
• Time in Patent Office: Days
• US Class Current: 370/312
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• 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
• CPC Class Codes: H04W 4/06 Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
• CPC Class Codes: H04W 76/40 for selective distribution or broadcast

Abstract

Techniques for transmitting and receiving segmented broadcast messages to improve performance. At a transmitter, a broadcast message to be transmitted over a wireless channel is partitioned into a number of segments and a header is formed for each segment. Each segment header may include (1) a sequence number, (2) a first segment indicator, and/or (3) a last segment indicator. A segmented broadcast message is generated with the segments and their headers, and is transmitted multiple times to improve reliability. At a receiver, one or more message repetitions are received for the segmented broadcast message. Each received message repetition is processed to recover good segments, if any, for the broadcast message. The good segments from the received message repetition(s) are then combined to recover the broadcast message. The processing may terminate whenever all segments of the broadcast message have been recovered.

Claims

1. In a wireless communication system, a method for processing broadcast messages for transmission over a wireless channel, comprising:

receiving a broadcast message for transmission;

partitioning the broadcast message into a plurality of segments;

forming a header for each segment; and

generating a segmented broadcast message with the plurality of segments and the associated headers.

2. The method of claim 1, wherein each header includes a sequence number for the associated segment.

3. The method of claim 2, wherein each header further includes an indicator for whether or not the associated segment is a first segment of the broadcast message.

4. The method of claim 2, wherein each header further includes an indicator for whether or not the associated segment is a last segment of the broadcast message.

5. The method of claim 1, wherein the plurality of segments have equal length.

6. The method of claim 1, further comprising:

transmitting the segmented broadcast message a plurality of times over the wireless channel.

7. The method of claim 1, wherein the wireless communication system is a CDMA system.

8. The method of claim 7, wherein the partitioning, forming, and generating are performed within a Link Access Control (LAC) sublayer.

9. The method of claim 1, wherein the partitioning, forming, and generating are performed at a base station in the wireless communication system.

10. In a wireless communication system, a method for recovering broadcast messages received via a wireless channel, comprising:

receiving one or more message repetitions for a broadcast message that has been partitioned into a plurality of segments;

processing each received message repetition to recover good segments, if any, for the broadcast message; and

combining the good segments from the one or more message repetitions to recover the broadcast message.

11. The method of claim 10, wherein each good segment is identified based on an associated header.

12. The method of claim 11, wherein the header for each segment includes a sequence number for the segment.

13. The method of claim 10, further comprising:

identifying a last segment for a current message repetition being processed; and

determining whether or not the plurality of segments of the broadcast message have all been recovered from all message repetitions processed for the broadcast message.

14. The method of claim 10, further comprising:

terminating the processing if the plurality of segments of the broadcast message has all been recovered from a first message repetition.

15. The method of claim 10, further comprising:

processing a subsequent message repetition if at least one segment has not been recovered from all message repetitions processed for the broadcast message.

16. The method of claim 10, wherein the wireless communication system is a CDMA system.

17. A memory communicatively coupled to a digital signal processing device (DSPD) capable of interpreting digital information to:

receive a broadcast message for transmission;

partition the broadcast message into a plurality of segments;

form a header for each segment; and

generate a segmented broadcast message with the plurality of segments and the associated headers.

18. An apparatus in a wireless communication system, comprising:

means for receiving a broadcast message for transmission;

means for partitioning the broadcast message into a plurality of segments;

means for forming a header for each segment; and

means for generating a segmented broadcast message with the plurality of segments and the associated headers.

19. A transmitter unit in a wireless communication system, comprising:

a broadcast message generator operative to generate broadcast messages for transmission; and

a segmentation unit operative to partition each broadcast message into a plurality of segments, form a header for each segment, and generate a segmented broadcast message for the broadcast message with the plurality of segments and the associated headers.

20. The transmitter unit of claim 19, further comprising:

a framing unit operative to generate one or more frames for each segmented broadcast message.

21. The transmitter unit of claim 19, wherein each segmented broadcast message is transmitted a plurality of times over a wireless channel.

22. A base station comprising the transmitter unit of claim 19.

23. An apparatus in a wireless communication system, comprising:

means for receiving one or more message repetitions for a broadcast message that has been partitioned into a plurality of segments;

means for processing each received message repetition to recover good segments, if any, for the broadcast message; and

means for combining the good segments from the one or more message repetitions to recover the broadcast message.

24. A receiver unit in a wireless communication system, comprising:

a deframing unit operative to process frames received via a wireless channel to provide one or more message repetitions for a broadcast message that has been partitioned into a plurality of segments; and

an assembly unit operative to process each received message repetition to recover good segments, if any, for the broadcast message, and to combine the good segments from the one or more message repetitions to recover the broadcast message.

25. The receiver unit of claim 24, further comprising:

a buffer operative to store good segments recovered from the one or more received message repetitions for subsequent combining.

26. The receiver unit of claim 24, wherein the deframing unit and assembly unit are operative to process a subsequent message repetition if at least one segment has not been recovered from all message repetitions processed for the broadcast message.

27. A terminal comprising the receiver unit of claim 24.