Reference Signal Port Indication with Non-Uniform CDM Groups
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Solution Overview
Problem
The challenge of effectively indicating a larger number of orthogonal DMRS ports in 5G systems, particularly in MIMO technology, due to the increased demand for higher data rates and the need for accurate channel estimation, is not adequately addressed by existing methods.
Innovation Solution
A method and apparatus for indicating reference signal ports using non-uniform expansion based on channel delay spread, allowing for different quantities of orthogonal ports in code division multiplexing groups, ensuring orthogonality and improving channel estimation accuracy by allocating ports to terminal devices with varying delay spreads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If more orthogonal DMRS ports are allocated to support higher data rates and more transport layers, then the system capacity and spectral efficiency are improved, but the complexity of indicating and managing these ports increases
Solution Approach 1:
The patent divides the DMRS ports into multiple code division multiplexing groups (CDM groups), where each group contains a subset of orthogonal ports. This segmentation allows the system to manage a large number of ports by organizing them into manageable groups, each with its own identification characteristics, thereby reducing the overall indication complexity while supporting high system capacity through multiple layers
Solution Approach 2:
The patent introduces a new dimension for port indication by using code division multiplexing groups as an additional layer of organization. Instead of directly indicating individual ports from a large set, the system indicates CDM groups, and within each group, the specific port is determined by further parameters. This dimensional transformation reduces the indication complexity while maintaining the ability to support many orthogonal ports for high data rates
2Measurement precision
If code division multiplexing groups with different quantities of orthogonal ports are used to match varying delay spreads, then channel estimation accuracy is improved, but the complexity of configuring and managing these groups increases
Solution Approach 1:
The patent applies local quality by configuring different quantities of orthogonal ports in different CDM groups according to the specific delay spread characteristics of each group. Instead of using a uniform port configuration across all groups, the system tailors the port quantity to match the local channel characteristics, thereby improving channel estimation accuracy for each specific scenario while maintaining manageable configuration complexity through standardized group definitions
3Reliability
If non-uniform expansion of CDM groups is implemented to support varying delay spreads, then orthogonality between ports is maintained, but the complexity of signal processing increases
Solution Approach 1:
The patent uses parameter changes by implementing non-uniform expansion of CDM groups, where the number of orthogonal ports in each group is adjusted according to the delay spread characteristics. This parameter adjustment maintains port orthogonality by carefully selecting expansion factors that preserve the orthogonal property, while the standardized nature of these parameter changes keeps the signal processing complexity manageable through predefined transformation rules
Data Source
AI summary
A method applied to a communication apparatus includes receiving first information and second information from a network device, wherein the first information indicates reference signal port indexes corresponding to m code division multiplexing groups, m is a positive integer greater than or equal to 2, at least two of the m code division multiplexing groups support different quantities of orthogonal ports, and the second information indicates a first reference signal port index in a reference signal port correspondence indicated by the reference signal port indexes corresponding to the m code division multiplexing groups. Based on the first reference signal port index, a port used for a reference signal is determined.