CSI Mapping in NR Uplink via DMRS Adjacency

Solution Overview

Problem

There is no corresponding solution for how terminals map and transmit Channel State Information (CSI) in the New Radio (NR) system, which hinders efficient communication in MIMO systems.

Innovation Solution

A method where terminals receive uplink channel resource configuration signaling and DMRS configuration from the base station, determining a mapping symbol set adjacent to DMRS symbols, and code CSI information to map Rank Indication (RI) information onto specific Resource Elements (REs) for improved transmission success and decoding accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If CSI information is mapped to uplink channel resources in the NR system, then the transmission of channel state information is enabled, but there is no established mapping method causing transmission reliability issues

Engineering Contradiction:

Improvetransmission success rate of RI informationVSAvoidcomplexity of CSI mapping method

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent segments CSI information into different parts (RI information and other CSI information) and maps them to different resource elements. RI information is mapped to REs adjacent to DMRS symbols, while other CSI information is mapped to remaining REs, enabling differentiated treatment to improve transmission reliability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent performs preliminary mapping of RI information to REs adjacent to DMRS symbols before mapping other CSI information. This preliminary action ensures that critical RI information receives optimal resource allocation first, improving its transmission success rate

Inventive Principle:

Principle #10Preliminary action

2Measurement precision

If CSI information is transmitted without a defined mapping method, then the system maintains simplicity, but decoding accuracy of CSI information deteriorates

Engineering Contradiction:

Improvedecoding accuracy of CSI informationVSAvoidease of CSI mapping and transmission

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The patent applies local quality by assigning different mapping characteristics to different parts of CSI information. RI information is mapped to REs with higher reliability (adjacent to DMRS symbols), while other CSI information uses remaining REs, creating localized optimization for different data types

Inventive Principle:

Principle #3Local quality

3Reliability

If Rank Indication information is mapped to resource elements adjacent to DMRS symbols, then transmission success rate improves, but resource allocation complexity increases

Engineering Contradiction:

Improvetransmission success rateVSAvoidcomplexity of resource element mapping

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent performs preliminary mapping of RI information to REs adjacent to DMRS symbols before mapping other CSI information. This preliminary action ensures that critical RI information receives optimal resource allocation first, improving its transmission success rate

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent applies local quality by assigning different mapping characteristics to different parts of CSI information. RI information is mapped to REs with higher reliability (adjacent to DMRS symbols), while other CSI information uses remaining REs, creating localized optimization for different data types

Inventive Principle:

Principle #3Local quality

Data Source

PatentEP3681076B1CSI information reporting and receiving method and communication device

Publication Date: 2023.08.23 DATANG MOBILE COMM EQUIP CO LTD

Figure 1~2(c)
Figure 3~4A
Figure 4B~4C

AI summary

Provided in the embodiments of the present application are a channel state indication (CSI) information reporting and receiving method and a communication device, which are used to provide for a terminal in an NR system a solution for mapping CSI information to an uplink channel and transmitting the same. The method comprises: a terminal receives an uplink channel resource configuration signaling and/or a demodulation reference signal (DMRS) configuration signaling sent by a base station, and determines a mapping symbol set, wherein the DMRS configuration signaling is used to indicate the number of DMRSes configured by a system for an uplink channel and the time-frequency location of an occupied OFDM symbol, the uplink channel resource configuration signaling represents the time-frequency resource of the uplink channel, and the mapping symbol set is a set of symbols adjacent to the OFDM symbol; and the terminal measures a downlink channel, calculates CSI information, encodes the CSI information, and maps an information part comprising rank indication (RI) information onto an RE of at least one orthogonal frequency-division multiplexing (OFDM) symbol in the mapping symbol set to carry out transmission.