DMRS Sequence Configuration for Uplink Interference Reduction
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Solution Overview
Problem
Legacy LTE systems face challenges in flexibly controlling the sequence of Demodulation Reference Signals (DMRS) for uplink shared channels in future radio communication systems, which require different configuration and frequency hopping capabilities.
Innovation Solution
A user terminal with a transmitting section for uplink shared channels and a control section that configures the DMRS sequence based on parameters such as maximum length, number of symbols, and frequency hopping application, ensuring appropriate sequence configuration for future radio communication systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sequence hopping is applied every other two slots in legacy LTE systems, then inter-cell interference is reduced, but flexibility in controlling DMRS sequence for future radio communication systems is limited
Solution Approach 1:
The patent applies dynamics by making the DMRS sequence configuration adaptable to different transmission scenarios. The control section dynamically selects sequence hopping parameters based on frequency hopping application, DMRS maximum length, and number of DMRS symbols, transforming a static legacy approach into a dynamic future-oriented configuration system
Solution Approach 2:
The patent changes parameters by introducing multiple configurable parameters for DMRS sequence hopping including hopping direction, hopping offset, and hopping period. These parameters can be adjusted based on frequency hopping settings and DMRS configuration, allowing the system to adapt to different radio communication requirements without fixed constraints
2Adaptability or versatility
If frequency hopping is applied in future radio communication systems, then communication flexibility is improved, but sequence configuration becomes more complex
Solution Approach 1:
The patent merges frequency hopping configuration with DMRS sequence hopping configuration into a unified control mechanism. The control section jointly manages both frequency hopping and sequence hopping parameters, allowing coordinated optimization without requiring separate complex configuration systems
Solution Approach 2:
The patent creates a universal sequence configuration mechanism that handles both legacy and future radio communication requirements. The same control section manages sequence hopping for different scenarios including with and without frequency hopping, making the system multi-functional without requiring separate configuration systems
3Productivity
If DMRS configuration is adapted to different bandwidths and transmission configurations, then communication efficiency is improved, but sequence control complexity increases
Solution Approach 1:
The patent applies local quality by configuring DMRS sequence hopping parameters specifically according to local transmission characteristics. Different hopping parameters are applied based on local conditions such as frequency hopping application, DMRS maximum length, and number of symbols, optimizing performance for each specific transmission scenario
Data Source
AI summary
To appropriately configure a sequence to be applied to, for example, a reference signal in a future radio communication system, one aspect of a user terminal according to the present invention includes: a transmitting section that transmits an uplink shared channel and a Demodulation Reference Signal (DMRS) of the uplink shared channel; and a control section that controls a sequence to be applied to the DMRS based on at least one of a maximum length of the DMRS configured by a higher layer parameter, a number of symbols of the DMRS notified by downlink control information, and whether or not frequency hopping is applied.