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Transmitting packet data in mobile communication systems

A technology of transmission modulation and physical layer grouping, which is applied in the field of data transmission and can solve problems such as different performance

Inactive Publication Date: 2003-01-29
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using turbo codes as FEC codes requires a different packet combining mechanism, and since turbo codes are designed as error-correcting codes to perform very close to the "Shannon channel capacity limit", their performance varies significantly with code rate, unlike convolutional codes

Method used

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  • Transmitting packet data in mobile communication systems
  • Transmitting packet data in mobile communication systems
  • Transmitting packet data in mobile communication systems

Examples

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Embodiment Construction

[0046] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, well-known functions and constructions are not described in detail since they would obscure the invention in unnecessary detail.

[0047] As will be clearly explained below, when turbo codes are used for transmitting and retransmitting packet data in mobile communication systems (such as IS-2000 and UMTS), they require block coding combinations. Generation of subcodes from turbo codes and transmission of packets using subcodes according to the present invention will be described below. Specifically, when the number of modulation symbols corresponding to a subcode is greater than the number of transmittable modulation symbols, as many symbols as the difference are truncated in order to transmit packet data. The sub-codes are codes to be combined by block codes, whose code rate is lower than the mother code rate of the turbo code. I...

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Abstract

There is provided a device and method for transmitting packet data in a mobile communication system. A sub-code generator generates a plurality of sub-codes with the same or different code rates for the input of a PLP (Physical Layer Packet) information bit stream. A controller determines a minimum data rate by which the number of the modulation symbols of a sub-code generated by a predetermined modulation method is equal to or greater than the number of transmittable modulation symbols for each time period. A symbol pruner prunes part of the modulation symbols of the sub-code to make the number of the modulation symbols of the sub-code equal to the number of transmittable modulation symbols for the time period, if the number of the modulation symbols of the sub-code is greater than the number of transmittable modulation symbols for the time period.

Description

technical field [0001] The present invention generally relates to data transmission in a mobile communication system, and specifically relates to a packet data transmission device and method. Background technique [0002] For forward packet data transmission in a mobile communication system, a mobile station is allocated a forward dedicated channel (DCH) from a base station. Mobile communication systems as described below include satellite systems, ISDN, digital cellular systems, W-CDMA, UMTS, and IMT-2000. After receiving forward packet data, the mobile station determines whether the reception was successful, and if so, the mobile station transmits the packet data to its higher layer. On the other hand, if an error is detected from packet data, the mobile station requests retransmission through a HARQ (Hybrid Automatic Repeat Request) scheme. HARQ is a retransmission scheme that utilizes FEC (Forward Error Correction) and ARQ (Automatic Repeat Req...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/08H04L1/18H04W28/00H04W28/06
CPCH04L1/1819H04L1/0071H04L1/0069H04L1/1867H04L1/1845H04L1/0083H04B7/26H04W28/22
Inventor 金潣龟河相赫
Owner SAMSUNG ELECTRONICS CO LTD
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