Abnormal case handling for acknowledged mode transmission and unacknowledged mode transmission

• US 7,388,883 B2
• Filed: 05/02/2003
• Issued: 06/17/2008
• Est. Priority Date: 05/06/2002
• Status: Active Grant

• Current Assignee: Innovative Sonic Limited
• Original Assignee: Innovative Sonic Limited
• Inventors: Jiang, Sam Shiaw-Shiang
• Primary Examiner(s): TAYLOR, BARRY W
• Application Number:
  US10/428,549
• Publication Number:
  US 20030223385A1
• Time in Patent Office: 1,873 Days
• Field of Search: 370/395.1, 370/346, 370/252, 370/392, 370/394, 370/470
• US Class Current: 370/470
• CPC Class Codes: H04L 1/1628 List acknowledgements, i.e. the acknowledgement message consisting of a list of identifiers, e.g. of sequence numbers H04L1/1614 takes precedence
• CPC Class Codes: H04L 1/1664 the supervisory signal being transmitted together with payload signals; piggybacking
• CPC Class Codes: H04L 1/1685 the supervisory signal being transmitted in response to a specific request, e.g. to a polling signal
• CPC Class Codes: H04L 1/1809 Selective-repeat protocols
• CPC Class Codes: H04L 1/1832 Details of sliding window management
• CPC Class Codes: H04L 1/187 Details of sliding window management
• CPC Class Codes: H04W 99/00 Subject matter not provided for in other groups of this subclass

Abstract

Whenever the Receiver of this invention receives an AMD PDU or a UMD PDU with its “Length Indicator” having an invalid or a reserved value, the Receiver discards such a PDU and treats it as never received. The Receiver may report its receiving status accordingly if a report is required. This invention avoids invoking unnecessary RLC reset procedures and reduces the chance of losing HFN synchronization during AM or UM data transmissions.

Claims

1. A method to reduce the occurrences of radio link control (RLC) reset during data block transmission between a sender and a receiver in a wireless communication system, wherein data blocks may contain a plurality of fields, wherein the method comprising:

at the receiver;

receiving a data block from the sender while the data transmission operation is in an acknowledge mode;

determining a condition of a particular field of the plurality of fields of the data block; and

ignoring the data block when the condition of the particular field is one of a plurality of abnormal conditions;

wherein ignoring the data block includes treating the data block as if it has never been received instead of treating the data block as missing when preparing a status report.

2. The method of claim 1, wherein the particular field is a “

Length Indicator”

field.

3. The method of claim 2, wherein the one of the plurality of abnormal conditions comprises an invalid length indicator.

4. The method of claim 2, wherein the one of the plurality of abnormal conditions comprises a length indicator having a reserved value.

5. The method of claim 2, wherein treating the data block as if it has never been received further comprises:

checking a “

Polling Bit”

field of the data block; and

when the “

Polling Bit”

indicates that a status report is requested, reporting a receiving status with the content set as the data block has never been received.

6. A receiver for reducing the occurrences of radio link control (RLC) reset during data block transmission between a sender and a receiver in a wireless communication system, wherein data blocks may contain a plurality of fields, wherein the receiver comprising:

means for receiving data block from the sender while the data transmission operation is in an acknowledge mode;

means for determining a condition of a particular field of the plurality of fields of the data block; and

means for ignoring the data block when the condition of the particular field one of a plurality of abnormal conditions;

wherein ignoring the data block includes treating the data block as if it has never been received instead of treating the data block as missing when preparing a status report.

7. The receiver of claim 6, wherein the particular field is a “

Length Indicator”

field.

8. The receiver of claim 7, wherein the one of the plurality of abnormal conditions comprises an invalid length indicator.

9. The receiver of claim 7, wherein the one of the plurality of abnormal conditions comprises a length indicator having a reserved value.

10. The receiver of claim 7, wherein treating the data block as if it has never been received while preparing a status report further comprising:

means for checking a “

Polling Bit”

field of the data block; and

when the “

Polling Bit”

indicates that a status report is requested, means for reporting a receiving status with the content set as the data block has never been received.