DMRS Port And FD-OCC Signaling for Consistent UE Mapping
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Solution Overview
Problem
The increased number of orthogonal ports and length of frequency domain orthogonal cover code (FD-OCC) for DMRS in wireless communication networks leads to higher signaling overhead and inconsistent FD-OCC mapping among UEs, causing inter-UE interference.
Innovation Solution
A method for configuring and transmitting DMRS by indicating DMRS port indices and FD-OCC lengths, using default values for CDM groups without data to exclude impossible parameter combinations, thereby reducing signaling overhead and ensuring consistent FD-OCC mapping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of orthogonal ports for DMRS is increased, then the data throughput capacity is improved, but the signaling overhead is increased
Solution Approach 1:
The patent changes the parameter of FD-OCC length from traditional fixed values to extended values (4 or 6), and introduces new parameter combinations for DMRS configuration. This allows more orthogonal ports to be supported while using more efficient signaling methods to indicate the configuration, thus increasing data throughput capacity without proportionally increasing signaling overhead.
2Productivity
If the length of FD-OCC is increased, then the number of orthogonal ports is increased, but the FD-OCC mapping consistency among UEs deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-defining specific FD-OCC mapping rules and procedures before the actual DMRS transmission. The network device determines the FD-OCC length and mapping configuration in advance, and both the network device and terminal device follow the same pre-established mapping rules, ensuring consistent mapping among different UEs even when using extended FD-OCC lengths.
3Measurement precision
If the first power ratio of PDSCH to DMRS is used for extended FD-OCC, then the demodulation performance is improved, but the power allocation complexity is increased
Solution Approach 1:
The patent applies dynamics by making the power ratio adaptive rather than fixed. The first power ratio is specifically applied when extended FD-OCC length is used, while the second power ratio is used for traditional configurations. This dynamic power allocation strategy improves demodulation performance for extended FD-OCC without requiring complex real-time adjustments, as the power ratio selection is based on the pre-determined FD-OCC length.
Data Source
AI summary
Example embodiments of the present disclosure relate to an effective mechanism for handing the scenario of discontinuous coverage. In this solution, a terminal device receives a demodulation reference signal (DMRS) indication indicating at least one of at least one DMRS port index or a first length of frequency domain orthogonal cover code (FD-OCC) to be used by the terminal device; and determining, based on the DMRS indication, the number of code domain multiplexing (CDM) groups without data is a default value if at least one of the following: the first length of FD-OCC is longer than a second FD-OCC length, at least one of the at least one DMRS port index is comprised in a first port index set, or at least one of the at least one DMRS port index corresponds to the first length of FD-OCC. In this way, in signalling overhead is reduced.