METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING A PACKET VIA HIGH SPEED DOWNLINK PACKET ACCESS

• US 20110205945A1
• Filed: 05/06/2011
• Published: 08/25/2011
• Est. Priority Date: 12/12/2006
• Status: Active Grant

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Marinier, Paul, Cave, Christopher R., Roy, Vincent, Burchill, Stuart T.
• Granted Patent: US 10,205,564 B2
• Time in Patent Office: Days
• US Class Current: 370/310
• CPC Class Codes: H04L 1/0007 by modifying the frame length
• CPC Class Codes: H04L 1/1835 Buffer management
• CPC Class Codes: H04L 1/1874 Buffer management
• CPC Class Codes: H04L 69/32 Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
• CPC Class Codes: H04L 69/324 in the data link layer [OSI layer 2], e.g. HDLC
• 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: Y10S 370/912 Packet communications

Abstract

A method and apparatus for transmitting and receiving a packet via high speed downlink packet access (HSDPA) are disclosed. At least one HSDPA medium access control (MAC-hs) service data unit (SDU) is segmented into a plurality of segments. MAC-hs protocol data units (PDUs) are generated from the segments wherein each MAC-hs PDU includes at least one segment. Each MAC-hs PDU may include one segment from a single MAC-hs SDU. The size of the segments may match to the size of the MAC-hs PDUs minus the size of the header of the MAC-hs PDU. The sizes of the segments may be determined based on the number of segments to which the MAC-hs SDU is segmented. Alternatively, each MAC-hs PDU may include a combination of segments from a plurality of MAC-hs SDUs or a combination of at least one segment from one MAC-hs SDU and at least one entire MAC-hs SDU.

Claims

1. A method for receiving a packet via high speed downlink packet access (HSDPA), the method comprising:

receiving a plurality of HSDPA medium access control (MAC-hs) protocol data units (PDUs), each MAC-hs PDU comprising at least one segment of an MAC-hs service data unit (SDU);

storing segments of MAC-hs SDU for reassembly; and

discarding the stored segments of MAC-hs SDU on a condition that a timer expires before at least one of the segments of the MAC-hs SDU has been received.

2. The method of claim 1, further comprising:

reassembling segments of the MAC-hs SDU in the MAC-hs PDUs to the MAC-hs SDU based on a condition that the segments of the MAC-hs SDU have been received before the timer expires.

3. The method of claim 1, further comprising:

determining whether a transmission has failed for a segment of MAC-hs SDU.

4. The method of claim 1, further comprising:

discarding segments of the MAC-hs SDU that are waiting for reassembly on a condition that at least one segment of the MAC-hs SDU is lost.

5. The method of claim 1, further comprising:

detecting hybrid automatic repeat request (H-ARQ) process failure for a segment; and

discarding segments of the same MAC-hs SDU that are waiting for reassembly.

6. A wireless transmit/receive unit (WTRU) for receiving a packet via high speed downlink packet access (HSDPA), the WTRU comprising:

a physical layer for receiving a plurality of HSDPA medium access control (MAC-hs) protocol data units (PDUs), each MAC-hs PDU comprising at least one segment of an MAC-hs service data unit (SDU); and

an MAC-hs layer for discarding segments of the MAC-hs SDU stored for reassembly on a condition that a timer expires before at least one of the segments of the MAC-hs SDU has been received.

7. The WTRU of claim 6, wherein the MAC-hs layer is configured to reassemble segments of the MAC-hs SDU in the MAC-hs PDUs to the MAC-hs SDU based on a condition that the segments of the MAC-hs SDU have been received before the timer expires.

8. The WTRU of claim 6, wherein the MAC-hs layer is configured to determine whether a transmission has failed for a segment of MAC-hs SDU.

9. The WTRU of claim 6, wherein the MAC-hs layer is configured to discard MAC-hs SDU segments stored for reassembly on a condition that at least one segment of the MAC-hs SDU is lost.

10. The WTRU of claim 6, wherein the MAC-hs layer is configured to flush all segments of the same MAC-hs SDU that are waiting for reassembly from a buffer on a condition that a timer expires before all segments of the same MAC-hs SDU have been received.

11. The WTRU of claim 6, wherein the MAC-hs layer is configured to discard segments of the same MAC-hs SDU that are waiting for reassembly on a condition that hybrid automatic repeat request (H-ARQ) process failure is detected for a segment.

12. The WTRU of claim 6, wherein the MAC-hs layer is configured to store segments of MAC-hs SDU for reassembly.