FD-OCC for DMRS Port Orthogonalization in Multi-Release Terminals
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Solution Overview
Problem
In future radio communication systems, such as NR, the increase in the number of DMRS ports is required to accommodate terminals with different releases, but existing methods fail to appropriately orthogonalize these ports, leading to potential reductions in communication throughput.
Innovation Solution
A terminal is designed with a control section that applies a frequency domain orthogonal cover code (FD-OCC) with a sequence length greater than two to demodulation reference signals mapped to multiple resource elements, and a transmitting/receiving section that performs processing based on this FD-OCC, enabling efficient orthogonalization of DMRS ports across different releases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of DMRS ports is increased to accommodate terminals with different releases, then the adaptability of the system is improved, but the ability to appropriately orthogonalize the ports deteriorates
Solution Approach 1:
The patent extends the orthogonal cover code from traditional time-domain or frequency-domain single dimension to a two-dimensional structure combining both frequency domain and time domain. This allows DMRS ports to be orthogonalized across multiple dimensions simultaneously, enabling support for increased number of ports while maintaining orthogonalization capability across different terminal releases.
Solution Approach 2:
The patent segments the DMRS resource elements into multiple groups and applies different orthogonal cover codes to each segment. By dividing the resource elements and applying segmented orthogonalization, the system can support more DMRS ports while ensuring proper orthogonalization for terminals of different releases.
2Device complexity
If full digital operation is used in high frequency, then the device complexity is reduced, but the ability to support legacy terminals deteriorates
Solution Approach 1:
The patent designs a universal DMRS orthogonalization mechanism that works across different terminal releases and operational modes. The enhanced orthogonal cover code structure can serve both legacy terminals requiring traditional orthogonalization and new terminals utilizing full digital operation, making the system multi-functional without requiring separate mechanisms for each case.
Solution Approach 2:
The patent changes the parameters of the orthogonal cover code, specifically extending the sequence length beyond traditional values. This parameter change allows the system to maintain backward compatibility with legacy terminals while simultaneously supporting the increased port requirements of new terminals operating in full digital mode.
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes: a control section that assumes that a frequency domain orthogonal cover code (FD-OCC) having a sequence length of a number larger than two is applied to a demodulation reference signal mapped to a pair of resource elements the number of which is greater than two and that are being different in frequency; and a transmitting/receiving section that performs transmission processing or reception processing of the demodulation reference signal, based on the FD-OCC. According to one aspect of the present disclosure, even when there are terminals according to different releases, each of the terminals can appropriately perform communication.