Downlink user-specific demodulation reference signal transmission method and device

A technology of demodulation reference signal and transmission method, which is applied in the field of transmission of downlink user-specific demodulation reference signal, can solve problems such as inability to transmit downlink data, reduce NCT resource utilization, reduce NCT data demodulation performance, etc., to improve data Effects of demodulation performance, improved transmission efficiency, and spectrum utilization

Active Publication Date: 2016-12-28
DATANG MOBILE COMM EQUIP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In summary, in the DM-RS resource mapping method defined in Rel-10, DM-RS is not transmitted on OFDM symbols in the control region, and E-PDCCH and PDSCH on NCT are mapped to all OFDM symbols in a subframe in the time domain During uplink transmission, the channel estimation information on at least the first N OFDM symbols needs to be obtained through the extrapolation algorithm of the finite column DM-RS, which reduces the data demodulation performance on the NCT; and the DM-RS does not support 3 DwPTS Transmission in special subframes of OFDM symbols, resulting in the inability to transmit downlink data based on DM-RS in special subframes containing only 3 OFDM symbols, reducing the resource utilization of NCT

Method used

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  • Downlink user-specific demodulation reference signal transmission method and device
  • Downlink user-specific demodulation reference signal transmission method and device
  • Downlink user-specific demodulation reference signal transmission method and device

Examples

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Embodiment 1

[0139] Embodiment 1: Corresponding to the above method one or solution one or method one;

[0140] For regular downlink subframes (ie, downlink subframes other than TDD special subframes), the DM-RS mapping resource in the DM-RS resource mapping mode of the corresponding antenna port in Rel-10 is shifted in the time domain to obtain the following Figure 6a to Figure 6j The shown DM-RS resource mapping method;

[0141] For example: Method 1: Shift the first two columns of DM-RS mapping resources in Rel-10 to the second and third OFDM symbols (or the third and fourth OFDM symbols) to obtain Figure 6a (Under conventional CP) and Figure 6b (Under extended CP);

[0142] Method 2: Shift the last column of DM-RS mapping resources in Rel-10 to the second OFDM symbol (or the third OFDM symbol) to obtain Figure 6c (Under conventional CP) and Figure 6d (Under extended CP);

[0143] Method 3: Shift the first two columns of DM-RS mapping resources in Rel-10 to the first and second OFDM symbols...

Embodiment 2

[0153] Embodiment 2: Corresponding to the above method one or scheme one or method one;

[0154] For TDD special subframes, the DM-RS mapping resource in the DM-RS resource mapping mode of the corresponding antenna port in Rel-10 is shifted in the time domain to obtain the following Figure 7a to Figure 7i The DM-RS resource mapping method shown;

[0155] For example, in the case of regular CP: Method 1: Shift the first two columns of DM-RS mapping resources in Rel-10 to the first and second OFDM symbols to obtain Figure 7a ;

[0156] Manner 2: Shift the first two columns of DM-RS mapping resources in Rel-10 to the first and second OFDM symbols, and configure 1 / 2 / 6 / 7 for the special subframes to move the last two columns of DM-RS mapping resources to Shift 2 OFDM symbols backward (or 1 OFDM symbol backward) to get Figure 7b ;

[0157] Method 3: Shift the first two columns of DM-RS mapping resources in Rel-10 to the second and third OFDM symbols to obtain Figure 7c ;

[0158] When ex...

Embodiment 3

[0164] Embodiment 3: Corresponding to the above method two or scheme two or method two;

[0165] For regular downlink subframes, in the downlink regular CP, according to the subcarrier position of the DM-RS mapping resource in the DM-RS resource mapping mode of the corresponding antenna port in Rel-10, the second and third subcarriers in a subframe DM-RS mapping resources are added to the OFDM symbols to obtain Figure 8a The shown DM-RS resource mapping method;

[0166] When extending CP in the downlink, the sub-carrier position where the DM-RS mapping resource is located on the first two or the last two OFDM symbols of the DM-RS mapping resource included in the DM-RS resource mapping mode of the corresponding antenna port in Rel-10 , Add DM-RS mapping resources to the second and third OFDM symbols in a subframe to obtain Figure 8b or Figure 8c The shown DM-RS resource mapping manner; or on the first and second OFDM symbols, or the third and fourth OFDM symbols in a subframe, DM...

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Abstract

An embodiment of the invention discloses a downlink user dedicated demodulation reference signal (DM-RS) transmitting method and device and relates to the field of wireless communication. The downlink user dedicated DM-RS transmitting method and device are used for improving the data demodulation performance on a new carrier type (NCT) carrier. According to the downlink user dedicated DM-RS transmitting method, a base station determines mapping resources of DM-RSs in a current sub-frame according to the DM-RS resource mapping mode; the DM-RSs are mapped into the current sub-frame for transmission according to the determined DM-RS mapping resources; a terminal determines the mapping resources of the DM-RSs in the current sub-frame according to the DM-RS resource mapping mode; the DM-RSs transmitted in the current sub-frame is obtained according to the determined DM-RS mapping resources. The DM-RS mapping resources at least comprise a resource unit RE on at least one of N former orthogonal frequency division multiplexing (OFDM) codes of the current sub-frame, and N is an integer no less than 1. The method can be used for improving the modulation performance of data on the NCT carrier.

Description

Technical field [0001] The present invention relates to the field of wireless communication, and in particular to a transmission method and equipment for a dedicated demodulation reference signal for downlink users. Background technique [0002] On the legacy carrier of the Long Term Evolution-Advance (LTE-A) system, the Orthogonal Frequency Division Multiplexing (OFDM) symbols in a downlink subframe are divided into control regions and There are two parts of the data area, the control area is the first N OFDM symbols of the downlink subframe, such as figure 1 Shown. Among them, the possible values ​​of N are 1, 2, 3, 4, and N=4 is only applicable to carriers with a system bandwidth of 1.4MHz. Legacy downlink channels that carry downlink control information, such as Physical Downlink Control Channel (PDCCH), Physical Control Format Indicator Channel (PCFICH), and Physical Hybrid-ARQ Indicator Channel (Physical Hybrid-ARQ Indicator Channel, PHICH), which is transmitted in the co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
Inventor 高雪娟林亚男丁昱
Owner DATANG MOBILE COMM EQUIP CO LTD
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