SYSTEM AND METHOD FOR PRIORITIZATION OF RETRANSMISSION OF PROTOCOL DATA UNITS TO ASSIST RADIO-LINK-CONTROL RETRANSMISSION

• US 20100226316A1
• Filed: 05/20/2010
• Published: 09/09/2010
• Est. Priority Date: 05/10/2002
• Status: Active Grant

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Terry, Stephen E., Miller, James M., Chao, Yi-Ju
• Granted Patent: US 8,068,497 B2
• Time in Patent Office: Days
• US Class Current: 370/328
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 1/16 in which the return channel carries supervisory signals, e.g. repetition request signals
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1874 Buffer management
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 1/189 Transmission or retransmission of more than one copy of a message
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 28/0242 Determining whether packet losses are due to overload or to deterioration of radio communication conditions
• CPC Class Codes: H04W 72/56 based on priority criteria

Abstract

A medium access control (MAC) architecture reduces transmission latency for data block retransmissions. A plurality of data blocks are received and temporarily stored in a first memory (e.g., queue, buffer). The plurality of data blocks are then transmitted. A determination is made as to whether each of the transmitted data blocks was received successfully or needs to be retransmitted because the data block was not received successfully. Each of the transmitted data blocks that needs to be retransmitted is marked and temporarily stored in a second memory having a higher priority than the first memory. The marked data blocks are retransmitted before data blocks stored in the first memory location.

Claims

1. A method for wireless communication comprising:

storing a protocol data unit (PDU) in a first memory buffer for transmission;

transmitting the PDU;

receiving an acknowledgement that the PDU was either successfully received or unsuccessfully received;

wherein on a condition that the PDU was unsuccessfully received,

marking the PDU with an indication of the number of times that the PDU was unsuccessfully received; and

storing the unsuccessfully received and marked PDU in a second memory buffer for retransmission based on the marking such that the second memory buffer has a higher transmission priority than the first memory buffer so that the PDUs in the second memory buffer are transmitted in advance of PDUs stored in the first memory buffer.

2. The method of claim 1 wherein the PDU is transmitted over a high speed downlink shared channel.

3. The method of claim 1 further comprising assigning a unique transmission sequence number (TSN) to a PDU.

4. The method of claim 1 wherein a common channel priority indicator (CmCH-Pi) is used to indicate of the number of times the PDU was determined not to have been successfully received, the method further comprising:

transmitting a PDU with a higher number of times not received before transmitting a PDU with a lower number of times not received.

5. The method of claim 1 performed by a Node B.

6. A wireless communication apparatus comprising:

a transmitter configured to transmit a data block a number of times;

the transmitter configured to store the data block in a first memory queue for a first transmission thereof;

the transmitter configured to determine whether the data block was received successfully or was not received successfully;

the transmitter configured to mark the data block for retransmission, with an indication of the number of times a determination of non-successful receipt occurred for the data block, on a condition that the data block was not received successfully; and

the transmitter configured to store the data block for retransmission based on the marking indication in a second memory queue that has a higher transmission priority than the first memory queue such that the data block is transmitted in advance of data blocks stored in the first memory queue.

7. The apparatus of claim 6 wherein the transmitter is configured to transmit the data block over a high speed downlink shared channel.

8. The apparatus of claim 6 wherein the transmitter is configured to store the data block as a plurality of multiplexed protocol data units (PDUs).

9. The apparatus of claim 6 wherein the transmitter is configured to store the data block as a protocol data unit (PDU).

10. The apparatus of claim 6 wherein the transmitter is configured to assign a unique transmission sequence number (TSN) to the data block.

11. The apparatus of claim 6 wherein a common channel priority indicator (CmCH-Pi) is used to indicate of the number of times the data block was determined not to have been successfully transmitted and wherein the transmitter is configured to select the second memory queue based on reading the CmCH-Pi of the marked data block from among a plurality of memory queues that have higher transmission priority than the first memory queue.

12. The apparatus of claim 6 configured as a Node B.