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Reference signal transmission method and device

A reference signal and transmission method technology, which is applied in the field of reference signal transmission method and equipment, can solve the problem of high DCI overhead, and achieve the effect of cost saving

Active Publication Date: 2018-06-01
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] This paper provides a reference signal transmission method and equipment, which can solve the problem of excessive DCI overhead in the prior art

Method used

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  • Reference signal transmission method and device
  • Reference signal transmission method and device

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Embodiment 1

[0079] Currently, each codeword (CW) in LTE has a corresponding MCS, RV, and NDI indication field, and there are a total of 2 codewords corresponding to 2 transmission blocks (TB, transmission block) to transmit data. LTE users support multi-layer transmission, and each data layer corresponds to a DMRS port. For initial transmission, when the number of data layers allocated by a user is greater than 1, 2 TB are required for transmission. In NR, for initial transmission, when the number of data layers allocated by a user is greater than 4, only 2 TB are required for transmission. That is to say, in one CW, the number of data layers or the number of DMRS ports allocated to the UE can be one of 1, 2, 3, and 4. At the same time, in order to support multi-user MIMO, each DMRS port may have a different scrambling ID, similar to n in LTE SCID .In MU-MIMO, often one user is one CW. Moreover, in MU-MIMO, NR supports non-transparent transmission, that is, the base station needs to te...

Embodiment 2

[0104] In NR, the uplink transmission is different from the downlink, because the uplink is divided into the case with channel reciprocity and the case without channel reciprocity. When there is no channel reciprocity, the UE has no way to obtain the uplink precoding matrix and the number of transmission layers by estimating the downlink CSI-RS (channel state information reference signal). At this time, the base station needs to notify the user of the precoding matrix index (TPMI: Transmit Precoding Matrix Indicator) when scheduling data. We call this scheduling method a codebook-based transmission method because TPMI is an index in the uplink codebook. Of course, the same as the downlink, the base station also needs to notify the user of the port information of the DMRS.

[0105] As for the reference signal, an important point different from LTE in NR is that phase noise tracking reference signal (PTRS: phase tracking reference signal) is introduced in NR. The main purpose is...

Embodiment 3

[0145] For uplink, when there is channel reciprocity, the base station can calculate the precoding matrix for uplink transmission according to the SRS sent by the user, and the user can also calculate the equivalent uplink precoding matrix through the downlink CSI-RS, so when scheduling data It is not necessary to notify the user of the index of the precoding matrix used for scheduling, that is, TPMI (Transmit recoding Matrix Indicator). At this time, the base station can configure several SRI (SRS resource indicators) for the user. The precoding used by the user when sending uplink data is the precoding of the SRS corresponding to the SRI. The SRS resource indicated by the SRI is the one that the UE has sent before. . For convenience, the SRS resources indicated by one SRI are all single-port SRSs, and one SRS resource may correspond to one DMRS port. If the base station indicates 2 SRIs to the user in the DCI, it corresponds to 2 DMRS ports, that is, 2 data layers. When th...

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Abstract

The invention discloses a reference signal transmission method and device and relates to the technology of new radio (NR). The reference signal transmission method provided by the invention comprisesthe steps of configuring indicator information of a to-be-transmitted reference signal through utilization of indicator bits of any one or more types of following information: demodulated reference signal (DMRS) port information, phase noise tracking reference signal (PTRS) port corresponding information, code block group (CBG) related notification information, SRI (SRS resource indicator) information of SRS resources, transmit precoding matrix indicator TPMI information and transmit rank indicator TRI information; and transmitting the reference signal.

Description

technical field [0001] The present invention relates to new air interface (NR, New Radio) technology, in particular to a reference signal transmission method and equipment. Background technique [0002] Currently, the physical layer technology of New Radio (NR, New Radio) is under intense discussion in the 3rd Generation Partnership Project (3GPP, 3rd Generation Partnership Project) RAN1. Flexibility and efficiency have always been the goal of NR physical layer design. It seems that the pursuit of maximum flexibility for physical layer reference signals has also become a trend. This is because the requirements for demodulating reference signals in different application scenarios may be different. In addition, NR supports data transmission at high frequencies, so multi-antenna beamforming technology must be introduced to cope with the huge path loss and other losses at high frequencies, such as rain attenuation and fading caused by vegetation absorption. Beamforming techno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/00H04W72/04
CPCH04L5/0048H04L5/0053H04W72/23H04L5/0051H04B7/0639H04B7/063
Inventor 蒋创新李儒岳陈艺戬鲁照华梅猛王飞鸣张淑娟
Owner ZTE CORP
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