Method and device for HARQ transmission

Abstract

The present invention discloses an HARQ (Hybrid Automatic Repeat Request) transmission method. A base station receives signals sent by a terminal to perform signal detection, decoding and CRC verification; if the CRC verification passes, determining identification information of the terminal according to terminal information carried in signals, and sending ACK information and the identification information of the terminal; and if the CRC verification does not pass, sending NACK information, or allowing HARQ information not to be sent. According to the invention, the problem that errors are generated when the terminal detects ACK / NACK signals caused by conflict.

Description

technical field [0001] The present application relates to the technical field of wireless communication, and in particular to a hybrid automatic repeat request (HARQ) transmission method and device. Background technique [0002] With the rapid development of the information industry, especially the growing demand from the mobile Internet and the Internet of Things (IoT, internet of things), unprecedented challenges are brought to future mobile communication technologies. For example, according to the report ITU-R M.[IMT.BEYOND 2020.TRAFFIC] of the International Telecommunication Union ITU, it can be predicted that by 2020, the growth of mobile traffic will increase by nearly 1,000 times compared to 2010 (4G era), and the number of user equipment connections will also increase. It will exceed 17 billion. As massive IoT devices gradually penetrate into mobile communication networks, the number of connected devices will become even more astonishing. In response to this unprece...

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Problems solved by technology

[0003] In 5G, there is a need to support massive machine-type communication (mMTC) services, and its connection density will reach one million connections per square kilometer, which is much higher than the link density supported by existing standards. , the existing orthogonal multiple access methods, such as Orthogonal Frequency Division Multiple Access (OFDMA) technology, can no longer meet the demand of millions of connections required by mMTC in 5G

[0008] For non-orthogonal multiple access technology-based scheduling-free transmission, the existing HARQ transmission method in LTE-A cannot well solve the problem of retransmission indication

First of all, for the access scenario with a large number of connections in 5G, since the number of access users carried on the same time-frequency resource is larger than the typical scenario in LTE-A, the ACK / NACK information of more users needs to be multiplexed into the same physical On resource blocks, the mapping method of PHICH in LTE-A needs to be further enhanced; secondly, for scheduling-free transmission, there may be conflicts between DMRS and multiple access resources. At this time, the transmission method of HARQ in LTE-A and In the resource mapping mode, users using the same multiple access resource and DMRS will not be able to distinguish whether the ACK or NACK signal corresponds to the user's uplink resource transmission, resulting in a reduction in retransmission efficiency and even a reduction in user data transmission reliability; finally , if there is a resource conflict, it is difficult to merge the retransmitted received data of different redundant versions

[0009] In short, the HARQ transmission method in LTE-A cannot be well applied to non-orthogonal multiple access technology-based scheduling-free transmission, and a new solution is needed

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