DMRS Mapping for Wireless Communication Scheduling
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing demodulation reference signals (DMRS) for data transmission and reception, particularly in handling varying numbers of DMRSs and maintaining scheduling flexibility and MU-MIMO capabilities.
Innovation Solution
A method for determining the location of DMRSs based on the maximum number of symbols and physical channels, allowing for flexible scheduling and efficient mapping, even when the number of DMRSs is fewer than set by higher layer signaling, by mapping them to the same location as the preset maximum number, enabling MU-MIMO between terminals with different symbol mappings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of DMRSs is reduced below the maximum number set by higher layer signaling, then resource efficiency improves, but scheduling flexibility and MU-MIMO capabilities deteriorate
Solution Approach 1:
The patent implements dynamic DMRS mapping where the position of DMRS symbols is adjusted based on the actual number of DMRSs to be transmitted. When fewer than the maximum number of DMRSs are scheduled, the mapping positions are dynamically reconfigured to maintain proper spacing and coverage, thereby preserving scheduling flexibility while using fewer reference signals.
Solution Approach 2:
The system changes the mapping parameters of DMRS based on the actual scheduling requirements. By adjusting the symbol positions and resource element allocations dynamically according to the number of active DMRSs, the system optimizes resource usage while maintaining the necessary flexibility for different scheduling scenarios and MU-MIMO configurations.
2Device complexity
If DMRS mapping positions are fixed according to maximum number, then device complexity reduces, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent segments the DMRS mapping into configurable position sets, where different symbol positions can be selected based on the actual number of DMRSs needed. This segmentation allows the system to choose from predefined mapping patterns rather than using a single fixed mapping, improving resource utilization without significantly increasing complexity.
Solution Approach 2:
The DMRS mapping structure is designed to be universal, supporting both full and reduced DMRS configurations through a single flexible framework. The same mapping mechanism handles different numbers of DMRSs by selecting appropriate positions from a unified set of rules, avoiding the need for separate complex mapping logic for different scenarios.
3Reliability
If DMRSs are mapped to different locations for different terminals, then MU-MIMO performance improves, but device complexity increases
Solution Approach 1:
The patent applies local quality by assigning different DMRS mapping positions to different terminals based on their specific requirements. Each terminal's DMRS positions are optimized locally for its channel conditions and scheduling needs, while the overall system maintains manageable complexity through standardized mapping rules that apply uniformly across all terminals.
Data Source
AI summary
The present invention relates to a method and device for operating a terminal in a wireless communication system. According to the present invention, downlink control information is transmitted to a terminal and can include symbol information related to the last symbol of a downlink shared channel. A method and device can be provided wherein a terminal transmits a first demodulation reference signal(DMSR) and at least one second DMRS for demodulating downlink data, and transmits data through the downlink shared channel, and a symbol position to which the at least one second DMRS is mapped is determined according to the symbol information.