PUCCH DMRS Mapping with Fixed OFDM Symbol Counts
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Solution Overview
Problem
Existing communication systems in LTE and NR face challenges in efficiently managing and demodulating Physical Uplink Control Channels (PUCCH) and Channel State Information (CSI) due to uncertainties in the number of OFDM symbols and resource element mappings, which affect communication efficiency.
Innovation Solution
The proposed solution involves a terminal apparatus and base station apparatus that generate and process PUCCH signals by assuming a fixed number of OFDM symbols, allowing for precise mapping of DMRS and UCI symbols, thereby enhancing communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of OFDM symbols for PUCCH is determined dynamically based on actual signal generation, then adaptability to varying symbol durations is improved, but demodulation accuracy deteriorates due to mapping uncertainties
Solution Approach 1:
The patent applies preliminary action by pre-determining the PUCCH duration L and using this fixed value to pre-calculate the DMRS symbol positions and UCI symbol allocations before actual signal transmission. This allows the receiver to prepare accurate demodulation parameters in advance, eliminating mapping uncertainties that would otherwise occur with dynamic determination.
Solution Approach 2:
The patent changes the parameter approach from dynamic to fixed by establishing L as a predetermined parameter. This fixed parameter then drives all subsequent resource element mappings including DMRS positions and UCI allocations, creating a stable reference framework that improves demodulation accuracy while still accommodating varying symbol durations through the flexibility of the underlying resource grid structure.
2Productivity
If DMRS and UCI symbols are mapped based on actual PUCCH signal generation, then resource utilization is improved, but mapping precision deteriorates due to uncertainty in OFDM symbol count
Solution Approach 1:
The patent applies preliminary action by pre-determining the PUCCH duration L and using this fixed value to pre-calculate the DMRS symbol positions and UCI symbol allocations before actual signal transmission. This allows for precise mapping calculations to be performed in advance, eliminating the uncertainty that would otherwise affect mapping precision.
Solution Approach 2:
The patent changes the parameter approach from dynamic to fixed by establishing L as a predetermined parameter. This fixed parameter then drives all subsequent resource element mappings including DMRS positions and UCI allocations, creating a stable reference framework that improves mapping precision while maintaining resource utilization efficiency through the flexibility of the underlying resource grid structure.
3Adaptability or versatility
If PUCCH demodulation is performed without assuming fixed OFDM symbol count, then flexibility in handling variable symbol durations is improved, but communication reliability deteriorates due to mapping ambiguities
Solution Approach 1:
The patent applies preliminary action by pre-determining the PUCCH duration L and using this fixed value to pre-calculate the DMRS symbol positions and UCI symbol allocations before actual signal transmission. This allows the receiver to prepare accurate demodulation parameters in advance, eliminating mapping ambiguities that would otherwise occur with dynamic determination.
Solution Approach 2:
The patent changes the parameter approach from dynamic to fixed by establishing L as a predetermined parameter. This fixed parameter then drives all subsequent resource element mappings including DMRS positions and UCI allocations, creating a stable reference framework that improves communication reliability while still accommodating varying symbol durations through the flexibility of the underlying resource grid structure.
Data Source
AI summary
Provided are a channel generation unit configured to generate a time domain signal of a PUCCH mapped from an X-th OFDM symbol to an (X+L)-th OFDM symbol in a slot, and a transmitter configured to transmit the PUCCH. In a case that the time domain signal of the X-th OFDM symbol is generated based at least on contents of resource elements included in an (X+1)-th OFDM symbol, a set of OFDM symbols to which a DMRS of the PUCCH is mapped is given based at least on an assumption that the number of OFDM symbols of the PUCCH is L.