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Method, system and device for selecting demodulation reference signal (DMRS) pattern information

A technology for demodulating reference signals and pattern information, which is applied in the field of long-term evolution, and can solve problems such as guaranteed transmission gain, decreased accuracy of OFDM symbol channel estimation, and interference

Active Publication Date: 2014-10-29
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Currently, in LTE R11, DMRS patterns (Pattern) are only sent on Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) symbol 5 and OFDM symbol 6, resulting in accurate channel estimation in the first 5 OFDM symbols. problem of declining
Therefore, a scheme of moving DMRS OFDM symbols forward is proposed, but this scheme only has a gain in spectral efficiency at medium and high speeds with high SNR
In addition, in LTE, there is also a scenario where the compatible carrier and the new carrier share the same channel. Once the DMRS OFDM occupies the PDCCH OFDM of the compatible carrier, the PDCCH of the compatible carrier will cause greater interference to the DMRS of the new carrier, resulting in poor channel estimation performance. The decrease of the system leads to the decrease of the average spectral efficiency of the system
[0004] It can be seen that the DMRS patterns used in the prior art for DMRS transmission cannot guarantee the transmission gain in different environments

Method used

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  • Method, system and device for selecting demodulation reference signal (DMRS) pattern information
  • Method, system and device for selecting demodulation reference signal (DMRS) pattern information
  • Method, system and device for selecting demodulation reference signal (DMRS) pattern information

Examples

Experimental program
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Effect test

Embodiment 1

[0234] Embodiment 1. In the base station and the terminal, two DMRS patterns are respectively predefined, and the DMRS patterns are as follows: Figure 4 and Figure 5 shown.

[0235] The operation process on the base station side is as follows:

[0236] The base station uses high-level signaling or a predefined method to configure one or several DMRS pattern information for the terminal; when the base station sends data to the terminal, the base station indicates the DMRS pattern that the terminal uses when receiving downlink data through high-level signaling .

[0237] For example, when the terminal is in a low-speed and low-frequency selection scenario, the base station can configure the terminal through high-level signaling such as: Figure 4 As shown in the DMRS pattern, the overhead of reference signal resources can be saved and the throughput of the system can be improved under the premise of ensuring the accuracy of DMRS estimation. When the terminal is in a high-s...

Embodiment 2

[0242] Embodiment 2. In the base station and the terminal, two DMRS patterns are respectively predefined, and the DMRS patterns are as follows: Figure 4 and Figure 5 shown.

[0243] When sending data to the terminal, the base station adds 1 bit to the DCI Format2D to instruct the terminal to send the DMRS pattern in the current subframe, and at the same time indicate the DMRS pattern that the terminal uses when receiving the DMRS. For example, in subframe 0, since the interference received by the terminal is relatively small, the value of the 1 bit can be 0 to indicate that the terminal adopts figure 1 The DMRS pattern receives DMRS, which can increase the accuracy of DMRS estimation and avoid collision with PSS / SSS. In subframe 1, due to the large interference received by the terminal, at this time, the value of the 1 bit can be 1 to indicate the use of figure 2 DMRS Pattern Receive DMRS.

Embodiment 3

[0244] Embodiment 3, the base station and the terminal predefine two DMRS patterns, or the base station configures two DMRS patterns to the terminal through high-level signaling; the base station dynamically instructs the base station to send DMRS in the scheduling subframe through the existing bits of PDCCH or EPDCCH R11 The DMRS pattern used. Such processing can reduce standard effort and reduce signaling overhead. The terminal receives the DMRS according to the learned DMRS pattern.

[0245] The base station and the terminal predefine two DMRS patterns such as Figure 4 and Figure 5 As shown, when the base station sends data to the terminal, the base station determines the DMRS pattern to be sent by using the MCS modulation method, and at the same time notifies the terminal of the DMRS pattern used when receiving the DMRS through the MCS. For example, when the MCS modulation method is QPSK / 16QAM / 64QAM, the base station adopts Figure 4 The DMRS pattern is used to send ...

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Abstract

The invention discloses a method for selecting demodulation reference signal (DMRS) pattern information. The method comprises the following steps: informing a terminal of selected DMRS pattern information in a preset way through a base station; transmitting a DMRS to the terminal according to the selected DMRS pattern information through the base station. A system and a device for selecting the DMRS pattern information are further disclosed. By adopting the method, the system and the device, different DMRS pattern information can be selected according to different environments to transmit the DMRS, thereby ensuring the accuracy and transmission performance of channel estimation.

Description

technical field [0001] The present invention relates to the field of Long Term Evolution (LTE, Long Term Evolution), in particular to a method, system and device for selecting demodulation reference signal (DMRS) pattern information. Background technique [0002] In Long Term Evolution (LTE, Long Term Evolution), user equipment (UE, User Equipment) transparently receives downlink data through DMRS; uses DMRS to support dynamic and transparent switching between SU-MIMO and MU-MIMO, and supports interference estimation using DMRS , can greatly improve the interference cancellation performance of the receiving side. [0003] Currently, in LTE R11, DMRS patterns (Pattern) are only sent on Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) symbol 5 and OFDM symbol 6, resulting in accurate channel estimation in the first 5 OFDM symbols. the problem of declining degrees. Therefore, a scheme of shifting DMRS OFDM symbols forward is propos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L1/06
CPCH04L5/0094H04L5/0051H04W72/23
Inventor 郭森宝孙云锋张峻峰左志松
Owner ZTE CORP
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