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Method for performing compressed mode-based HARQ in a mobile communication system

A mobile communication system, a technology of responding to signals, applied in wireless communication, communication between multiple stations, error prevention/detection using a return channel, etc., capable of solving problems such as packet data transmission delays

Inactive Publication Date: 2005-09-28
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since Node B cannot receive ACK from HS-PDSCH, Node B retransmits the corresponding HS-PDSCH, causing packet data transmission delay

Method used

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  • Method for performing compressed mode-based HARQ in a mobile communication system
  • Method for performing compressed mode-based HARQ in a mobile communication system
  • Method for performing compressed mode-based HARQ in a mobile communication system

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0056] image 3 is a schematic diagram illustrating a method for sending ACK / NACK representative values ​​according to the first embodiment of the present invention. refer to image 3 , a UE (not shown) receiving packet data from a Node B (not shown) through the HS-PDSCH 330 transmits ACK / NACK information on the received packet data. In this regard, UEs supporting compressed mode cannot successfully transmit ACK / NACK for a time corresponding to the TG period 314 .

[0057] In this case, the UE transmits ACK / NACK for transmission failure in the TG period 314 through an available subframe 344 after the TG period. That is to say, the UE uses the subframe 344 after the TG period 314 as the recovery period for the ACK / NACK that fails to be transmitted in the TG period 314 .

[0058] The ACK / NACK value sent in recovery period 344 is determined by A R to represent, A R Represents ACK / NACK signals 331, 332, and 333 with respect to a 0th subframe, a 1st subframe, and a 2nd subfram...

no. 2 example

[0068] Figure 4 It is a schematic diagram illustrating a method of sending N ACK / NACK signals through an ACK / NACK field according to the second embodiment of the present invention. refer to Figure 4 , the second embodiment of the present invention sequentially allocates ACK / NACK signals 431, 432, and 433 for the 0th subframe, 1st subframe, and 2nd subframe to the ACK / NACK field of the recovery period 444 before transmission. In other words, the second embodiment of the present invention defines the ACK / NACK field 444 of the HS-DPCCH 440 corresponding to the second subframe as the recovery period 444 . After this definition, UE (not shown) performs (N, 1) iterative coding lower than (10, 1) iterative coding in ACK / NACK field 444 of HS-DPCCH 440, and sequentially transmits multiple ACK / NACK signals . Here, N is an integer greater than 1.

[0069] The UE can increase the transmit power to compensate for the coding performance degradation that may be caused by the reduced codi...

no. 3 example

[0071] Figure 5 is a schematic diagram illustrating a method of transmitting transmission-delayed ACK / NACK information using a CQI field according to the third embodiment of the present invention. refer to Figure 5 , the third embodiment of the present invention uses the existing coding scheme to send ACK / NACK about the 2nd subframe of HS-PDSCH 530 through the ACK / NACK field, and uses a higher or lower coding rate than the existing coding scheme ACK / NACK signals 531 and 532 of the 0th subframe and the 1st subframe of the HS-PDSCH 530 that fail to be transmitted in the TG period 514 are sent through the CQI field 544 in the coding scheme of . That is, the UE (not shown) transmits ACK / NACK signals 531 and 532 for the 0th subframe and the 1st subframe through the CQI field of the first HS-DPCCH subframe after the TG period 514 ends. The UE sends the ACK / NACK information 563 on the 2nd subframe 533 of the HS-PDSCH 530 through the ACK / NACK field 563 using the (10,1) iterative c...

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Abstract

A method for preventing a transmission delay of data packets transmitted through an uplink due to a transmission gap (TG) period occurring when a user equipment (UE) performs handover from a Node B to its neighbor Node B in a mobile communication system. In the method, the Node B sequentially transmits data packets to the UE through a plurality of subframes, and the UE transmits response signals for the data packets transmission-delayed for the TG period to the Node B through a subframe of an uplink dedicated physical control channel (DPCCH), following the TG period.

Description

technical field [0001] The present invention generally relates to a mobile communication system supporting High Speed ​​Downlink Packet Access (HSDPA). In particular, the present invention relates to a method for minimizing the transmission delay of Hybrid Automatic Repeat reQuest (HARQ) in uplink compressed mode. Background technique [0002] Generally, HSDPA refers to a scheme for supporting high-speed downlink packet data transmission in a Universal Mobile Telecommunications System (Universal MobileTelecommunication System, UMTS), a next-generation asynchronous communication system, and HSDPA supports a high-speed downlink shared channel ( HS-DSCH), shared control channel (HS-SCCH) for HS-DSCH, and uplink dedicated physical control channel for HS-DSCH. The UMTS communication system supports compressed mode. [0003] In order to support HSDPA, Adaptive Modulation and Coding (Adaptive Modulation and Coding, AMC) and HARQ have been proposed. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26H04L1/16H04L1/18H04W28/04H04W28/06H04W36/12H04W36/18H04W36/36H04W76/02
CPCH04W36/12H04L1/1829H04L1/1628H04L1/1803H04W36/0088H04B7/2631
Inventor 申桥淑柳准相崔奎贤金宪基
Owner SAMSUNG ELECTRONICS CO LTD