Common Comb Reference Signal for OFDM and DFTS-OFDM
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Solution Overview
Problem
The use of different frequency division multiple access (FDM) technologies in downlink (DL) and uplink (UL) in wireless communication systems, such as OFDM and DFTS-OFDM, leads to issues in reference signal design and handling, particularly in LTE and the emerging NR standard, due to differing transmission schemes.
Innovation Solution
Implementing a common comb-based reference signal structure for both OFDM and DFTS-OFDM in uplink transmissions, allowing for symmetry and ease of handling across different FDM technologies, with the option to combine comb structures for increased density or leave resource elements empty to manage PAPR/CM differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different FDM technologies (OFDM and DFTS-OFDM) are used for uplink transmissions, then transmission flexibility and adaptability are improved, but reference signal design complexity and handling difficulty increase
Solution Approach 1:
The patent applies universality by designing a common reference signal structure that works for both OFDM and DFTS-OFDM transmissions. The comb-based reference signal pattern is defined in a waveform-independent manner, allowing the same reference signal design to serve multiple FDM technologies without requiring separate designs for each waveform type.
Solution Approach 2:
The patent segments the reference signal design into waveform-independent components (comb structure, resource element allocation patterns) and waveform-specific parameters (PAPR/CM constraints). This segmentation allows the common comb-based structure to be reused across different FDM technologies while accommodating their specific requirements through parameter adjustment.
2Adaptability or versatility
If different FDM technologies are used, then transmission scheme diversity is improved, but reference signal handling symmetry and ease of operation deteriorate
Solution Approach 1:
The comb-based reference signal structure serves as a universal solution that maintains handling symmetry across different FDM technologies. By defining reference signals in terms of comb patterns rather than waveform-specific structures, the patent enables symmetric and unified reference signal processing for both OFDM and DFTS-OFDM transmissions.
3Quantity of substance
If comb structures are combined for increased density, then reference signal coverage is improved, but PAPR/CM management complexity increases
Solution Approach 1:
The patent applies local quality by allowing different comb configurations (single comb or combined combs) in different transmission scenarios based on local requirements. When high reference signal density is needed, multiple combs can be combined; when PAPR/CM management is critical, simpler single-comb structures can be used. This localized adaptation optimizes both density and complexity management.
Data Source
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AI summary
The present disclosure pertains to a terminal (10) for a Radio Access Network, the terminal (10) being adapted for transmission based on a first frequency division multiple access, FDMA, technology and for transmission based on a second frequency division multiple access technology. The terminal (10) is adapted for transmitting reference signaling having a comb structure for transmission based on either the first FDMA technology or the second FDMA technology. The disclosure also pertains to related devices and methods.