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Device and method for transmitting HARQ ACK/NACK

A coding block and modulation symbol technology, applied in the field of HARQ ACK/NACK transmission, can solve the problems of limited number of sub-carriers and limited effect of frequency diversity, and achieve the effect of increasing the effect of frequency diversity and maintaining the nature of single carrier

Active Publication Date: 2008-07-16
BEIJING SAMSUNG TELECOM R&D CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For OFDM systems, when ACK / NACK is based on FDM or TDM transmission, because the number of subcarriers configured by the system for each ACK / NACK is limited, the frequency diversity effect obtained by independently sending each ACK / NACK is limited; when ACK When / NACK is based on CDM transmission, because the wireless channel is frequency selective, each ACK / NACK sent is an interference signal to each other

Method used

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  • Device and method for transmitting HARQ ACK/NACK
  • Device and method for transmitting HARQ ACK/NACK
  • Device and method for transmitting HARQ ACK/NACK

Examples

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Embodiment

[0053] This section presents two embodiments of the invention. In order to avoid making the description of this patent too lengthy, in the following description, detailed descriptions of functions or devices that are well known to the public are omitted.

no. 1 example

[0055] In this embodiment, it is assumed that the system sends ACK / NACK information based on FDM multiplexing, and each ACK / NACK occupies 3 subcarriers, and the OFDM technology or SCFDMA technology used here is not distinguished.

[0056] Such as Figure 6 As shown, it is assumed that the system needs to transmit two ACK / NACK messages, and the system allocates resources twice as much as sending a single ACK / NACK message, that is, the system allocates 6 subcarriers for carrying the two ACK / NACK messages (601-606) . Such as Figure 6 As shown, according to the method of the present invention, the first ACK / NACK information is mapped to the I branch (607) transmission of these 6 subcarriers, and the second ACK / NACK information is mapped to the Q branch of these 6 subcarriers Road (608) transmission.

[0057] Such as Figure 7As shown, it is assumed that the system needs to transmit four ACK / NACK messages, and the system allocates four times the resources for sending a single AC...

no. 2 example

[0063] In this embodiment, it is assumed that the system adopts the SCFDMA physical layer technology, and sends ACK / NACK information based on the CAZAC sequence signal form on each SCFDMA symbol.

[0064] As shown in Figure 10, assuming that the system needs to send two ACK / NACK information, the two ACK / NACK information (1001, 1002) are respectively mapped to the I branch and the Q branch of the modulation symbol to form a modulation symbol (1003), and then The modulation symbol (1003) is multiplied by the CAZAC sequence (1004), and after serial / parallel conversion (1005), Pre-DFT and subsequent SCFDMA signal processing (1006) are performed. The length of the CAZAC sequence (1004) is determined by the number of subcarriers used to transmit ACK / NACK information in the SCFDMA symbol. The method shown in FIG. 10 is applicable to both the CDM multiplexing mode and the FDM multiplexing mode.

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Abstract

The invention discloses a method for transmitting an HARQ ACK / NACK message which comprises the steps that: a first communication node sends the data containing a plurality of code blocks, here each code block is defined as a message block which is independently added with a CRC and a code; a second communication node receives data signals of the first communication node and judges whether each code block correctly receives; the second communication node respectively sends an HARQ ACK or an NACK message aiming at each code block, here each sent ACK / NACK message can occupy I branches or Q branches of at least one part of modulation symbols in the entire physical resources used to transmit the HARQ ACK / NACK messages; the first communication node receives the HARQ ACK / NACK messages sent by the second communication node and correspondingly sends new data or retransmit data. The method of the invention can increase the frequency diversity effect during the transmission of the ACK / NACK messages; when the method is used in the SCFDMA system, the method can maintain the single carrier characteristic of the SCFDMA system.

Description

technical field [0001] The present invention relates to a wireless communication system, and more specifically relates to a device and method for transmitting HARQ ACK / NACK in a wireless communication system. Background technique [0002] Now, the 3GPP standardization organization has begun to carry out the long-term evolution (LTE) of its existing system specifications. Among the many physical layer transmission technologies, the downlink transmission technology based on Orthogonal Frequency Division Multiplexing (OFDM) and the uplink transmission technology based on Single Carrier Frequency Division Multiple Access (SCFDMA) are research hotspots. OFDM technology is essentially a multi-carrier modulation communication technology. Its basic principle is to decompose a high-rate data stream into several low-rate data streams and transmit them simultaneously on a group of mutually orthogonal sub-carriers. OFDM technology has performance advantages in many aspects due to its m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/18
Inventor 李迎阳张玉建李小强李周镐
Owner BEIJING SAMSUNG TELECOM R&D CENT
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