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Method for transmitting ACK/NACK messages

A technology for message and user equipment, applied in the field of communication, can solve the problems of collision, limited capacity, and no PHICH available, and achieve the effect of reducing overhead, optimizing efficiency, controlling and optimizing overhead

Active Publication Date: 2014-10-29
ALCATEL LUCENT SHANGHAI BELL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 2) The research on NCT will support independent operation, which means that there is no traditional carrier aggregation with NCT, so there is no traditional PHICH available
[0006] 3) The ACK / NACK capacity of the existing PHICH is limited, which leads to collisions when cross-carrier scheduling is applied to NCT

Method used

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  • Method for transmitting ACK/NACK messages
  • Method for transmitting ACK/NACK messages
  • Method for transmitting ACK/NACK messages

Examples

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Embodiment Construction

[0034] figure 1 It shows a schematic diagram of two-layer link adaptation according to an embodiment of the present invention. in figure 1 The link adaptation in the (E)CCE according to the present invention is combined with the link adaptation on the existing (E)CCE level. Hereinafter, the link adaptation in the (E)CCE according to the present invention will be described in detail with reference to various drawings.

[0035] figure 2 It shows a flowchart of a method for sending an ACK / NACK message to a user equipment in a base station according to an embodiment of the present invention.

[0036] First, in step S201, the base station determines the index position of the ACK / NACK message in the DCI information for each of the multiple ACK / NACK messages corresponding to the uplink transmissions of multiple user equipments, and sends the The / NACK message is placed in the index position. Among them, the load length of the DCI information can be fixed according to the bandwidth of t...

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Abstract

The invention provides a method for transmitting ACK / NACK messages. As for each ACK / NACK message in multiple ACK / NACK messages corresponding to uplink transmission of multiple user equipment, a base station determines index position of the ACK / NACK message in downlink control information and puts the ACK / NACK message at the index position. Then, the ACK / NACK message is coded by the use of orthogonal sequence and repetition coding. Finally, the base station sends the downlink control information to the multiple user equipment. By the method provided by the invention, overhead of the ACK / NACK corresponding to the uplink transmission can flexibly be controlled and optimized, and the balance between flexibility of resource allocation and robustness of ACK / NACK transmission is realized. In addition, the method has little influence on existing standards and a current system and has good compatibility, and the method also can be applied in a scene of NCT lacking PHICH.

Description

Technical field [0001] The present invention relates to communication technology, in particular to a method for transmitting ACK / NACK messages. Background technique [0002] In order to perform hybrid automatic repeat feedback (HARQ) for uplink transmission, there are several solutions in the industry. One is to carry the new data identifier (NDI) in the downlink control information (DCI), and the other is to use a special physical hybrid automatic repeat indicator channel (PHICH) to specifically transmit HARQ ACK / NACK messages. Compared with the former, the latter is more efficient and can ensure robust feedback for uplink transmission. [0003] In LTE-A Release 12, which is currently in the standardization process, the concept of New Carrier Type (NCT) is proposed. The NCT base station (eNB) / cell uses a new carrier type to achieve high data throughput. To achieve this goal, channels such as CRS (Cell Specific Reference Signal), PHICH (Physical Hybrid Automatic Repeat Indicatio...

Claims

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Application Information

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IPC IPC(8): H04L1/16H04W72/14
Inventor 刘铮蒋琦
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD
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