Data transmission method for HSDPA

• US 7,924,879 B2
• Filed: 09/28/2009
• Issued: 04/12/2011
• Est. Priority Date: 01/05/2002
• Status: Expired due to Term

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, So-Young, Yeo, Woon-Young, Yi, Seung-June
• Primary Examiner(s): LEE, CHI HO A
• Application Number:
  US12/568,570
• Publication Number:
  US 20100020815A1
• Time in Patent Office: 561 Days
• Field of Search: 370/412, 370/469, 370/474
• US Class Current: 370/469
• 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 28/14 using intermediate storage

Abstract

In the data transmission method of an HSDPA system according to the present invention, a transmitter transmits Data Blocks each composed of one or more data units originated from a same logical channel, and a receiver receives the Data Block through a HS-DSCH and distributes the Data Block to a predetermined reordering buffer. Since each Data Block is composed of the MAC-d PDUs originated from the same logical channel, it is possible to monitor the in-sequence delivery of the data units, resulting in reduction of undesirable queuing delay caused by logical channel multiplexing.

Claims

1. A method for processing packet data in a communications system, the method comprising:

receiving a medium access control (MAC) protocol data unit (PDU), wherein the MAC PDU comprises a header portion and a payload portion, wherein the payload portion comprises at least two MAC service data units (SDUs) and the header portion comprises an identifier used to map the received at least two MAC SDUs to one reordering buffer,

wherein the identifier is common to the at least two MAC SDUs and reordering buffers are configured per a respective identifier;

buffering the received at least two MAC SDUs in the mapped one reordering buffer based on the identifier; and

processing the buffered at least two MAC SDUs for delivering to an upper layer.

2. The method of claim 1, wherein the steps of processing and buffering are performed in a medium access control (MAC) layer.

3. The method of claim 1, wherein the at least two MAC SDUs are delivered to the upper layer if the at least two MAC SDUs were received in-sequence, otherwise, the at least two MAC SDUs are stored in the one reordering buffer.

4. The method of claim 3, wherein the at least two MAC SDUs are sequentially delivered with other MAC SDUs stored in the one reordering buffer until there is no stored MAC SDU for a next sequential value.

9. The method of claim 1, wherein the identifier is a logical channel identifier.

10. The method of claim 1, wherein the identifier identifies a specific data stream in which the at least two MAC SDUs belong.

5. An apparatus for processing packet data in a communication system, the apparatus comprising:

a protocol entity configured to;

receive a medium access control (MAC) protocol data unit (PDU), wherein the MAC PDU comprises a header portion and a payload portion, wherein the payload portion comprises at least two MAC service data units (SDUs) and the header portion comprises an identifier used to map the received at least two MAC SDUs to one reordering buffer,

wherein the identifier is common to the at least two MAC SDUs and reordering buffers are configured per a respective identifier;

buffer the received at least two MAC SDUs in the mapped one reordering buffer based on the identifier; and

process the buffered at least two MAC SDUs for delivering to an upper layer.

6. The apparatus of claim 5, wherein the protocol entity is a medium access control (MAC) layer.

7. The apparatus of claim 5, wherein the at least two MAC SDUs are delivered to the upper layer if the at least two MAC SDUs were received in-sequence, otherwise, the at least two MAC SDUs are stored in the one reordering buffer.

8. The apparatus of claim 7, wherein the at least two MAC SDUs are sequentially delivered with other MAC SDUs stored in the one reordering buffer until there is no stored MAC SDU for a next sequential value.

11. The apparatus of claim 5, wherein the identifier is a logical channel identifier.

12. The apparatus of claim 5, wherein the identifier identifies a specific data stream in which the at least two MAC SDUs belong.