DMRS Sequence Generation for Small Resource Block Allocations
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Solution Overview
Problem
Current wireless communication systems face limitations in generating demodulation reference signal (DMRS) sequences for small resource block allocations, particularly in low peak-to-average power ratio (PAPR) properties, leading to insufficient power transmission and increased noise, especially when using limited sets of computer-generated sequences.
Innovation Solution
The proposed solution involves using two or more prime numbers to generate a set of DMRS sequences, rather than relying on a single prime number, and filtering out high cross-correlated sequences to reduce inter-cell interference, while employing the Zadoff-Chu function for sequence generation and cyclic extension to achieve adequate sequence lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single prime number is used to generate DMRS sequences, then the sequence generation process is simple, but the candidate set of sequences is limited and PAPR properties are insufficient
Solution Approach 1:
The patent segments the sequence generation process by dividing the candidate set into multiple subsets, where each subset is generated using a different prime number. This segmentation allows the system to maintain simplicity in the generation process for each subset while expanding the overall candidate set versatility. The control signaling indicates which prime number (and thus which subset) should be used, providing adaptability without complicating the individual generation processes.
2Device complexity
If a single prime number is used for sequence generation, then the generation function is simple, but PAPR properties and power transmission efficiency deteriorate
Solution Approach 1:
The patent merges multiple sequence generation functions into a unified approach by combining multiple prime numbers in the sequence generation process. Instead of using a single prime number generation function, the system merges multiple prime-based generation functions and selects from their combined candidate sets. This merging improves PAPR properties and power transmission efficiency while maintaining the simplicity of each individual generation function through the use of standard Zadoff-Chu sequences.
3Productivity
If limited sets of computer-generated sequences are used, then the sequence generation is efficient, but noise and interference increase
Solution Approach 1:
The patent introduces an additional dimension to the sequence generation process by incorporating multiple prime numbers alongside the traditional single prime number approach. This dimensional expansion creates a multi-dimensional search space for optimal sequences, allowing the system to generate sequences with better interference properties. The control signaling mechanism adds another dimension for selecting which prime number (and thus which dimension of the sequence space) to use, enabling efficient generation while reducing interference.
4Adaptability or versatility
If multiple prime numbers are used to expand the candidate set, then PAPR properties improve, but the control signaling complexity increases
Solution Approach 1:
The patent uses copying by creating standardized control signaling structures that indicate the selected prime number and root number pair. Instead of complex control mechanisms, the system copies and transmits standardized indication signals that map to pre-configured prime number pairs. This copying approach expands the candidate set versatility while keeping control signaling simple, as the UE can directly map the copied indicators to the appropriate sequence generation parameters without complex processing.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. For example, a network entity may transmit, and a user equipment (UE) may receive, for generation of a demodulation reference signal sequence corresponding to a resource block allocation, control signaling indicative of a selection of a root number and a prime number. The prime number is one of two or more prime numbers used to generate a set of demodulation reference signal sequences for the resource block allocation. The UE may generate, using the prime number and the root number as input into a sequence generation function, the demodulation reference signal sequence of the set of demodulation reference signal sequences corresponding to the resource block allocation and transmit a physical uplink shared channel transmission including the demodulation reference signal sequence.